On Feb 17, 2010, at 2:13 PM, Terrence Ireland wrote:
TestHistogram_A is a function that plots a histogram,
It creates a plot-description but does not "plot" it.
then returns 3. For
me it fails to display the plot, at least in the order given below
TestHistogram_B is a function that plots a histogram, then exits.
The only
difference between
the 2 functions is that B does not return 3. It displays the plot.
This problem does not occur when histogram is replaced by boxplot
histogram is a lattice function. Lattice functions return a value
which is a list describing the plot. This phenomenon is covered in a
FAQ:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f
Their use is in the following statements:
Data <- c(1,1,1,2,2)
Data <- data.frame(Data)
TestHistogram_A <- function (my.data) { histogram(my.data[,
1],main="TEST");
3}
You have thrown away the histogram in your "_A" function. Boxplot os a
base graphics function which prints by "side-effect" and returns NULL.
If you want to print() the histogram, then do so within your function.
TestHistogram_A(Data)
TestHistogram_B <- function (my.data) { histogram(my.data[,
1],main="TEST") }
TestHistogram_B(Data)
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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