This vignette explains how to find parts of a pivot table - either one or more data groups (i.e. row/column headings) or one or more cells in the body of the pivot table.
This is often useful to retrieve either a specific value/values, or to change the appearance of specific headings/cells - similar to the conditional formatting capabilities of many off-the-shelf tools.
This is a long vignette. Some readers may prefer to jump to the summary at the end for a more concise description of the functions and frequently used parameters.
The following pivot table is used as the basis of the examples in the rest of this vignette:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$renderPivot()The findRowDataGroups() and findColumnDataGroups() functions are used to find data groups (i.e. row and/or column headings) that match specific criteria. The functions return a list of data group objects.
These functions can operate in two different ways, specified by the matchMode argument.
matchMode="simple" is used when matching only one variable, e.g. TrainCategory=“Express Passenger”.
matchMode="combinations" is used when matching for combinations of variables, e.g. TrainCategory=“Express Passenger” and PowerType=“DMU”, which would return the “DMU” data group underneath “Express Passenger” (but not the “DMU” data group underneath “Ordinary Passenger”). Examples of each follow below.
These functions also accept the following arguments:
variableNames - a character vector specifying the name/names of the variables to find - useful for finding all of the data groups for a specific variable.variableValues - a list specifying the variable names and values to find.
totals - a word that specifies how totals are matched (overrides the finer settings above) - must be one of:
include to match total and non-total data groups.exclude to match only non-total data groups.only to match only total data groups.calculationNames - a character vector specifying the name/names of the calculations to find.includeDescendantGroups - a logical value specifying whether only the top-most matching data group for each row/column is returned, or whether the descendant groups are also included.Several examples follow below. In each of the examples the data groups that have been found are highlighted in yellow by specifying a different style.
The examples in this section use column data groups, but all are equally applicable to row data groups.
matchMode="simple"“simple” match mode is the default. The following examples illustrate how the “simple” matching mode works.
Find all of the data groups for the “TrainCategory” variable:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(variableNames="TrainCategory")
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()Find all of the data groups for the “PowerType” variable with the values “DMU” and “HST”:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(variableValues=list("PowerType"=c("DMU", "HST")))
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()Exclude totals:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(variableNames="TrainCategory", totals="exclude")
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()Find only totals:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(variableNames="TrainCategory", totals="only")
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()Find all of the data groups for the “TrainCategory” variable with the value “Ordinary Passenger”, including the descendant data groups:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(
variableValues=list("TrainCategory"="Ordinary Passenger"),
includeDescendantGroup=TRUE)
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()To select the right-most/bottom total data group:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(
variableValues=list("TrainCategory"="**"),
includeDescendantGroup=TRUE)
pt$setStyling(groups=groups, declarations=list("background-color"="#FFFF00"))
pt$renderPivot()matchMode="combinations"The following examples illustrate how the “combinations” matching mode works.
The key concept to understand here is that the filtering criteria (i.e. the variableName(s) and variableValues) set for a data group also apply to all descendant data groups. For example, in the example pivot table above, the “DMU” under “Express Passenger” effectively means WHERE ("TrainCategory"="Express Passenger") AND ("PowerType"="DMU").
Find all of the data groups that have filter criteria specified for both the “TrainCategory” and “Power Type” variables:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(matchMode="combinations",
variableNames=c("TrainCategory", "PowerType"))
pt$setStyling(groups=groups, declarations=list("background-color"="#00FFFF"))
pt$renderPivot()In the example above, the first row of headings relates only to the “TrainCategory” variable. The second row of headings relates both to the “PowerType” variable and the “TrainCategory” variable.
Find all of the data groups for the “PowerType” variable with the values “DMU” and “HST” for the “TrainCategory” of “Express Passenger”:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(matchMode="combinations",
variableValues=list("TrainCategory"="Express Passenger", "PowerType"=c("DMU", "HST")))
pt$setStyling(groups=groups, declarations=list("background-color"="#00FFFF"))
pt$renderPivot()In the above example, the highlighted “DMU” and “HST” data groups are subject to the “Express Passenger” filtering since they are underneath that data group.
The “combinations” match mode effectively AND’s the criteria together, i.e. the data groups must match both “TrainCategory”=“Express Passenger” AND “PowerType”=(“DMU” OR “HST”).
The “simple” match mode, by contrast, effectively OR’s the criteria together, i.e. the data groups must match either “TrainCategory”=“Express Passenger” OR “PowerType”=(“DMU” OR “HST”). Changing the match mode back to simple (but otherwise leaving the previous example unchanged):
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(
variableValues=list("TrainCategory"="Express Passenger", "PowerType"=c("DMU", "HST")))
pt$setStyling(groups=groups, declarations=list("background-color"="#00FFFF"))
pt$renderPivot()Another example - finding all of the “PowerType” groups under “Express Passenger”:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(matchMode="combinations", variableNames="PowerType",
variableValues=list("TrainCategory"="Express Passenger"))
pt$setStyling(groups=groups, declarations=list("background-color"="#00FFFF"))
pt$renderPivot()To select the sub-total data group under “Express Passenger”:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
groups <- pt$findColumnDataGroups(matchMode="combinations",
variableValues=list("TrainCategory"="Express Passenger", "PowerType"="**"))
pt$setStyling(groups=groups, declarations=list("background-color"="#00FFFF"))
pt$renderPivot()The getCells() function is used to retrieve one or more cells by row/column number in the body of the pivot table. The arguments can be specified in two different ways depending on the value of the specifyCellsAsList argument.
In versions v0.4.0 and earlier, the default value of the specifyCellsAsList argument was FALSE. The default value is now TRUE.
The getCells() function returns a list of cell objects.
specifyCellsAsList=TRUETo get cells when specifyCellsAsList=TRUE:
rowNumbers argument and leaving the columnNumbers argument set to the default value of NULL, orcolumnNumbers argument and leaving the rowNumbers argument set to the default value of NULL, orcellCoordinates argument as a list of vectors of length 2, where each element in the list is the row and column number of one cell, e.g. list(c(1, 2), c(3, 4)) specifies two cells, the first located at row 1, column 2 and the second located at row 3, column 4.Examples of the above are given below. The retrieved cells are highlighted in orange by specifying a different style.
specifyCellsAsList=TRUERetrieving the first and third rows:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=TRUE, rowNumbers=c(1, 3))
pt$setStyling(cells=cells, declarations=list("background-color"="#FFCC66"))
pt$renderPivot()specifyCellsAsList=TRUERetrieving the second column:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=TRUE, columnNumbers=2)
pt$setStyling(cells=cells, declarations=list("background-color"="#FFCC66"))
pt$renderPivot()specifyCellsAsList=TRUERetrieving the raw/formatted values of the cell in the third column on the second row:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=TRUE, cellCoordinates=list(c(2, 3)))
pt$setStyling(cells=cells, declarations=list("background-color"="#FFCC66"))
cat("The raw value of the cell is", cells[[1]]$rawValue, "and the formatted value is", cells[[1]]$formattedValue, ".")## The raw value of the cell is 732 and the formatted value is 732 .pt$renderPivot()Retrieving multiple cells (2nd row-3rd column, 3rd row-4th column and 5th row-7th column):
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=TRUE, cellCoordinates=list(c(2, 3), c(3, 4), c(5, 7)))
pt$setStyling(cells=cells, declarations=list("background-color"="#FFCC66"))
pt$renderPivot()specifyCellsAsList=TRUERetrieving the 2nd row, 4th column and 5th row-7th column cell:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=TRUE, rowNumbers=2, columnNumbers=4, cellCoordinates=list(c(5, 7)))
pt$setStyling(cells=cells, declarations=list("background-color"="#FFCC66"))
pt$renderPivot()specifyCellsAsList=FALSETo get cells when specifyCellsAsList=FALSE:
rowNumbers argument and leaving the columnNumbers argument set to the default value of NULL, orcolumnNumbers argument and leaving the rowNumbers argument set to the default value of NULL, orrowNumbers and columnNumbers arguments, orNA, e.g. to retrieve whole rows, specify the row numbers as the rowNumbers but set the corresponding elements in the columnNumbers vector to NA.Examples of the above are given below. The retrieved cells are highlighted in green by specifying a different style.
specifyCellsAsList=FALSEWhen retrieving just rows, the rowNumbers argument is specified the same irrespective of whether specifyCellsAsList is TRUE or FALSE.
Retrieving the first and third rows:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=FALSE, rowNumbers=c(1, 3))
pt$setStyling(cells=cells, declarations=list("background-color"="#00FF00"))
pt$renderPivot()specifyCellsAsList=FALSEWhen retrieving just columns, the columnNumbers argument is specified the same irrespective of whether specifyCellsAsList is TRUE or FALSE.
Retrieving the second column:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=FALSE, columnNumbers=2)
pt$setStyling(cells=cells, declarations=list("background-color"="#00FF00"))
pt$renderPivot()specifyCellsAsList=FALSEWhen retrieving cells, the rowNumbers and columnNumbers arguments are specified differently depending on whether specifyCellsAsList is TRUE or FALSE.
Retrieving the raw/formatted values of the cell in the third column on the second row:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=FALSE, rowNumbers=2, columnNumbers=3)
pt$setStyling(cells=cells, declarations=list("background-color"="#00FF00"))
cat("The raw value of the cell is", cells[[1]]$rawValue, "and the formatted value is", cells[[1]]$formattedValue, ".")## The raw value of the cell is 732 and the formatted value is 732 .pt$renderPivot()library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=FALSE, rowNumbers=c(2, 3, 5), columnNumbers=c(3, 4, 7))
pt$setStyling(cells=cells, declarations=list("background-color"="#00FF00"))
pt$renderPivot()specifyCellsAsList=FALSEWhen retrieving cells, the rowNumbers and columnNumbers arguments are specified differently depending on whether specifyCellsAsList is TRUE or FALSE.
Retrieving the 2nd row, 4th column and 5th row-7th column cell:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$getCells(specifyCellsAsList=FALSE, rowNumbers=c(2, NA, 5), columnNumbers=c(NA, 4, 7))
pt$setStyling(cells=cells, declarations=list("background-color"="#00FF00"))
pt$renderPivot()The findCells() function is used to search for cells within the body of the pivot table matching one or more criteria. The function returns a list of cell objects. This function has the following parameters:
variableNames - a character vector specifying the name/names of the variables to find - useful for finding all of the data groups for a specific variable.variableValues - a list specifying the variable names and values to find.
totals - a word that specifies how totals are matched (overrides the finer settings above) - must be one of:
include to match total and non-total cells.exclude to match only non-total cells.only to match only total cells.calculationNames - a character vector specifying the name/names of the calculations to find.minValue - a numerical value specifying a minimum value threshold when matching cells.maxValue - a numerical value specifying a maximum value threshold when matching cells.exactValues - vector specifying a set of allowed values when matching cells.includeNA - specify TRUE to include NA in the matched cells, FALSE to exclude NA values.includeNull - specify TRUE to include cells with no value, FALSE to exclude cells with no value.If multiple variable names and values are specified, then findCells() searches for cells that match all of the criteria - i.e. the equivalent of the combinations match method described above.
Several examples of the above are given below.
Finding cells that reference the “PowerType” variable:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableNames="PowerType")
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()All of the cells above reference the “PowerType” variable. For the findCells() function, the variableNames argument is only really used when a pivot table is constructed that has a custom layout.
Finding cells that reference the “DMU” and “HST” values for the “PowerType” variable:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableValues=list("PowerType"=c("DMU", "HST")))
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()Finding cells that reference the “DMU” and “HST” values for the “PowerType” variable and reference the “London Midland” value for the “TOC” variable:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableValues=list("PowerType"=c("DMU", "HST"), "TOC"="London Midland"))
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()Finding only totals cells that reference the “PowerType” variable:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableNames="PowerType", totals="only")
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()In the example, probably more total cells have been matched than expected.
To explicitly match only the total columns for the “PowerType” variable, specify two asterixes as the variable value:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableValues=list("PowerType"="**"))
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()To explicitly match only the sub-total columns for the “PowerType” variable (i.e. excluding the far right TrainCategory total column), use the following:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableValues=list("TrainCategory"="!*", "PowerType"="**"))
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()To find the grand total cell:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(variableValues=list("TrainCategory"="**", "PowerType"="**", "TOC"="**"))
pt$setStyling(cells=cells, declarations=list("background-color"="#FF00FF"))
pt$renderPivot()The findCells() and getCells() functions can be used to help conditionally format a pivot table.
For example, to highlight in red those cells in the basic example pivot table that have a value between 30000 and 50000:
library(pivottabler)
pt <- PivotTable$new()
pt$addData(bhmtrains)
pt$addColumnDataGroups("TrainCategory")
pt$addColumnDataGroups("PowerType")
pt$addRowDataGroups("TOC")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()")
pt$evaluatePivot()
cells <- pt$findCells(minValue=30000, maxValue=50000, includeNull=FALSE, includeNA=FALSE)
pt$setStyling(cells=cells, declarations=list("background-color"="#FFC7CE", "color"="#9C0006"))
pt$renderPivot()Another example: analysing the average arrival delay (in minutes) in the morning peak time, for the top 20 origin stations, broken down by the hour of the day (i.e. 5am, 6am, 7am, etc.), with the results formatted as follows:
The findCells() function is used to find the cells matching the criteria above. One of three custom styles (green, yellow or red) is then applied to the cells:
# calculate arrival delay information
library(dplyr)
library(lubridate)
library(pivottabler)
stations <- mutate(trainstations, CrsCodeChr=as.character(CrsCode))
topOrigins <- bhmtrains %>%
mutate(OriginChr=as.character(Origin)) %>%
filter(Origin != "BHM") %>%
group_by(OriginChr) %>%
summarise(TotalTrains = n()) %>%
ungroup() %>%
top_n(20, TotalTrains)
trains <- bhmtrains %>%
mutate(OriginChr=as.character(Origin), DestinationChr=as.character(Destination)) %>%
inner_join(topOrigins, by=c("OriginChr"="OriginChr")) %>%
inner_join(stations, by=c("OriginChr"="CrsCodeChr")) %>%
inner_join(stations, by=c("DestinationChr"="CrsCodeChr")) %>%
select(TOC, TrainCategory, PowerType, Origin=StationName.x,
GbttArrival, ActualArrival, GbttDeparture, ActualDeparture) %>%
mutate(GbttDateTime=if_else(is.na(GbttArrival), GbttDeparture, GbttArrival),
GbttHourOfDay=hour(GbttDateTime),
ArrivalDeltaMins=difftime(ActualArrival, GbttArrival, units="mins"),
ArrivalDelayMins=ifelse(ArrivalDeltaMins<0, 0, ArrivalDeltaMins)) %>%
filter(GbttHourOfDay %in% c(5, 6, 7, 8, 9, 10)) %>%
select(TOC, TrainCategory, PowerType, Origin, GbttHourOfDay, ArrivalDelayMins)
# create the pivot table
pt <- PivotTable$new()
pt$addData(trains)
pt$addColumnDataGroups("GbttHourOfDay")
pt$addRowDataGroups("Origin")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()", visible=FALSE)
pt$defineCalculation(calculationName="TotalDelayMins",
summariseExpression="sum(ArrivalDelayMins, na.rm=TRUE)", visible=FALSE)
pt$defineCalculation(calculationName="AvgDelayMins", type="calculation",
basedOn=c("TotalDelayMins", "TotalTrains"),
calculationExpression="values$TotalDelayMins/values$TotalTrains",
format="%.1f")
pt$evaluatePivot()
# apply the green style for an average arrival delay of between 0 and 2 minutes
cells <- pt$findCells(minValue=0, maxValue=2, includeNull=FALSE, includeNA=FALSE)
pt$setStyling(cells=cells, declarations=list("background-color"="#C6EFCE", "color"="#006100"))
# apply the yellow style for an average arrival delay of between 2 and 4 minutes
cells <- pt$findCells(minValue=2, maxValue=4, includeNull=FALSE, includeNA=FALSE)
pt$setStyling(cells=cells, declarations=list("background-color"="#FFEB9C", "color"="#9C5700"))
# apply the red style for an average arrival delay of 4 minutes or greater
cells <- pt$findCells(minValue=4, includeNull=FALSE, includeNA=FALSE)
pt$setStyling(cells=cells, declarations=list("background-color"="#FFC7CE", "color"="#9C0006"))
pt$renderPivot()It is also possible to iterate through the cells to use a continuous colour scale as opposed to three separate styles. In the example below (using exactly the same data and calculations as above), some helper functions are defined which calculate a colour in a continuous colour scale. The colour scale used is roughly that described above (i.e. green to yellow to red):
# calculate arrival delay information
library(dplyr)
library(lubridate)
library(pivottabler)
stations <- mutate(trainstations, CrsCodeChr=as.character(CrsCode))
topOrigins <- bhmtrains %>%
mutate(OriginChr=as.character(Origin)) %>%
filter(Origin != "BHM") %>%
group_by(OriginChr) %>%
summarise(TotalTrains = n()) %>%
ungroup() %>%
top_n(20, TotalTrains)
trains <- bhmtrains %>%
mutate(OriginChr=as.character(Origin), DestinationChr=as.character(Destination)) %>%
inner_join(topOrigins, by=c("OriginChr"="OriginChr")) %>%
inner_join(stations, by=c("OriginChr"="CrsCodeChr")) %>%
inner_join(stations, by=c("DestinationChr"="CrsCodeChr")) %>%
select(TOC, TrainCategory, PowerType, Origin=StationName.x,
GbttArrival, ActualArrival, GbttDeparture, ActualDeparture) %>%
mutate(GbttDateTime=if_else(is.na(GbttArrival), GbttDeparture, GbttArrival),
GbttHourOfDay=hour(GbttDateTime),
ArrivalDeltaMins=difftime(ActualArrival, GbttArrival, units="mins"),
ArrivalDelayMins=ifelse(ArrivalDeltaMins<0, 0, ArrivalDeltaMins)) %>%
filter(GbttHourOfDay %in% c(5, 6, 7, 8, 9, 10)) %>%
select(TOC, TrainCategory, PowerType, Origin, GbttHourOfDay, ArrivalDelayMins)
# create the pivot table
library(pivottabler)
pt <- PivotTable$new()
pt$addData(trains)
pt$addColumnDataGroups("GbttHourOfDay")
pt$addRowDataGroups("Origin")
pt$defineCalculation(calculationName="TotalTrains", summariseExpression="n()", visible=FALSE)
pt$defineCalculation(calculationName="TotalDelayMins",
summariseExpression="sum(ArrivalDelayMins, na.rm=TRUE)", visible=FALSE)
pt$defineCalculation(calculationName="AvgDelayMins", type="calculation",
basedOn=c("TotalDelayMins", "TotalTrains"),
calculationExpression="values$TotalDelayMins/values$TotalTrains",
format="%.1f")
pt$evaluatePivot()
# colour scale helper functions
scaleNumber <- function(n1, n2, vMin, vMax, value) {
if(n1==n2) return(n1)
v <- value
if(v < vMin) v <- vMin
if(v > vMax) v <- vMax
if(n1<n2) {
return(n1+((v-vMin)/(vMax-vMin)*(n2-n1)))
}
else {
return(n1-((v-vMin)/(vMax-vMin)*(n1-n2)))
}
}
scale2Colours <- function(clr1, clr2, vMin, vMax, value) {
r <- round(scaleNumber(clr1$r, clr2$r, vMin, vMax, value))
g <- round(scaleNumber(clr1$g, clr2$g, vMin, vMax, value))
b <- round(scaleNumber(clr1$b, clr2$b, vMin, vMax, value))
return(paste0("#",format(as.hexmode(r), width=2), format(as.hexmode(g), width=2), format(as.hexmode(b), width=2)))
}
scale3Colours <- function(clr1, clr2, clr3, vMin, vMid, vMax, value) {
if(value <= vMid) return(scale2Colours(clr1, clr2, vMin, vMid, value))
else return(scale2Colours(clr2, clr3, vMid, vMax, value))
}
hexToClr <- function(hexclr) {
clr <- list()
clr$r <- strtoi(paste0("0x", substr(hexclr, 2, 3)))
clr$g <- strtoi(paste0("0x", substr(hexclr, 4, 5)))
clr$b <- strtoi(paste0("0x", substr(hexclr, 6, 7)))
return(clr)
}
# colour constants
textClrGreen <- hexToClr("#006100")
textClrYellow <- hexToClr("#9C5700")
textClrRed <- hexToClr("#9C0006")
backClrGreen <- hexToClr("#C6EFCE")
backClrYellow <- hexToClr("#FFEB9C")
backClrRed <- hexToClr("#FFC7CE")
# specify some conditional formatting, calculating the appropriate text colour and back colour for each cell.
cells <- pt$findCells(includeNull=FALSE, includeNA=FALSE)
formatCell <- function(cell) {
value <- cell$rawValue
textClr <- scale3Colours(textClrGreen, textClrYellow, textClrRed, 0.5, 2, 4, value)
backClr <- scale3Colours(backClrGreen, backClrYellow, backClrRed, 0.5, 2, 4, value)
pt$setStyling(cells=cell, declarations=list("background-color"=backClr, "color"=textClr))
}
invisible(lapply(cells, formatCell))
pt$renderPivot()findRowDataGroups() and findColumnDataGroups() functions are used to find data groups (i.e. row and/or column headings) that match specific criteria.
variableValues is the most commonly used parameter and specifies the variable values (matchMode="simple") or combination of values (matchMode="combinations") to find.pt$findColumnDataGroups(variableValues=list("PowerType"=c("DMU", "HST"))) returns all data groups where PowerType is either DMU or HST.getCells() function is used to retrieve one or more cells by row/column number in the body of the pivot table.
getCells() returns a list of cell objects.pt$getCells(specifyCellsAsList=TRUE, rowNumbers=2, columnNumbers=4, cellCoordinates=list(c(5, 7))) returns all cells in the second row, all cells in the fourth column and the cell in the seventh column on the fifth row.findCells() function is used to search for cells within the body of the pivot table matching one or more criteria.
findCells() returns a list of cell objects.variableValues is a commonly used parameter and specifies the variable values to find.minValue, maxValue and exactValues parameters.calculationNames parameter is used to only match those cells relating to specific calculations.pt$findCells(variableValues=list("PowerType"=c("DMU", "HST")), minValue=500, maxValue=5000) finds all cells where PowerType is either DMU or HST and the cell value is between 500 and 5000 inclusive.The full set of vignettes is: