R help - Jul 2013 - GGplot 2 – cannot get histogram and box plot axis to match.

Problem:
I am trying to get the histogram and box plot x axis to match. I?ve tried using
the expand_limits function to make the axis match but that didn?t make the axis
match. The histogram?s axis are still consistently larger than the ones for the
box plot (though the function did help). Does anyone have a suggestion as to
what I should do instead?


Background:
I am building a Shiny app that displays a histogram below a bar chart for a set
of data that a user uploads to the app. If you want to see the app, go here
http://spark.rstudio.com/jclow/Archive20130725HistogramApp/
To run the app, select ?Use Sample Data? , then select  ?MPG.city? under choose
a column, then finally select box plot.


Sample code:
Below is a snippet of my code to demonstrate the problems I have.

library(ggplot2)

#sample data from ggplot2
data(Cars93, package = "MASS")
dataSet <- Cars93

#variables to calculate the range to extend the axis
dataVector <- unlist(dataSet[,"MPG.city"]) 

dataRange <- max(dataVector) - min(dataVector)

graphRange <- c(min(dataVector) - dataRange/5,
                max(dataVector) + dataRange/5)

#making the box plot
theBoxPlot <- ggplot(dataSet,aes_string(x = "MPG.city",y =
"MPG.city"))

theBoxPlot = theBoxPlot  + geom_boxplot() + expand_limits(y= graphRange) +
coord_flip()
print(theBoxPlot)


#making the histogram
thePlot <- ggplot(dataSet,aes_string(x = "MPG.city"))
thePlot <-thePlot + geom_histogram()  + expand_limits(x= graphRange)

print(thePlot)


Thank you for taking the time to read this.

John Clow
UCSB Student

Dear John,

Use xlim() and ylim() instead of expand_limits()

library(ggplot2)

#sample data from ggplot2
data(Cars93, package = "MASS")
dataSet <- Cars93

#variables to calculate the range to extend the axis dataVector <-
unlist(dataSet[,"MPG.city"])

dataRange <- diff(range(dataSet$MPG.city))

graphRange <- c(min(dataSet$MPG.city) - dataRange/5,
                max(dataSet$MPG.city) + dataRange/5)

#making the box plot
theBoxPlot <- ggplot(dataSet,aes_string(x = "MPG.city", y =
"MPG.city"))

theBoxPlot <-
  theBoxPlot  + geom_boxplot() + coord_flip() + ylim(limits = graphRange)
print(theBoxPlot)


#making the histogram
thePlot <- ggplot(dataSet,aes_string(x = "MPG.city"))
thePlot <- thePlot + geom_histogram()  + xlim(graphRange)
print(thePlot)



ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more than
asking him to perform a post-mortem examination: he may be able to say what the
experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure
that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens John W. Clow
Verzonden: donderdag 25 juli 2013 20:03
Aan: r-help at r-project.org
Onderwerp: [R] GGplot 2 ? cannot get histogram and box plot axis to match.

Problem:
I am trying to get the histogram and box plot x axis to match. I?ve tried using
the expand_limits function to make the axis match but that didn?t make the axis
match. The histogram?s axis are still consistently larger than the ones for the
box plot (though the function did help). Does anyone have a suggestion as to
what I should do instead?


Background:
I am building a Shiny app that displays a histogram below a bar chart for a set
of data that a user uploads to the app. If you want to see the app, go here
http://spark.rstudio.com/jclow/Archive20130725HistogramApp/
To run the app, select ?Use Sample Data? , then select  ?MPG.city? under choose
a column, then finally select box plot.


Sample code:
Below is a snippet of my code to demonstrate the problems I have.

library(ggplot2)

#sample data from ggplot2
data(Cars93, package = "MASS")
dataSet <- Cars93

#variables to calculate the range to extend the axis dataVector <-
unlist(dataSet[,"MPG.city"])

dataRange <- max(dataVector) - min(dataVector)

graphRange <- c(min(dataVector) - dataRange/5,
                max(dataVector) + dataRange/5)

#making the box plot
theBoxPlot <- ggplot(dataSet,aes_string(x = "MPG.city",y =
"MPG.city"))

theBoxPlot = theBoxPlot  + geom_boxplot() + expand_limits(y= graphRange) +
coord_flip()
print(theBoxPlot)


#making the histogram
thePlot <- ggplot(dataSet,aes_string(x = "MPG.city")) thePlot
<-thePlot + geom_histogram()  + expand_limits(x= graphRange)

print(thePlot)


Thank you for taking the time to read this.

John Clow
UCSB Student

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