[R] ggplot2: qplot won't work

[Bryan Hanson]

Ralf, inside a function you'll need to print the plot using qplot.  Change
it to
P <- qplot(1:10, letters[1:10])
print(P)

This is good practice even at the console, as you can then modify your plots
in increments

P2 <- P + more commands (text, more points, altered annotations etc)
print(P2)
etc

Bryan
*************
Bryan Hanson
Acting Chair
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA




On 5/13/10 1:42 AM, "Ralf B" <ralf.bierig at gmail.com> wrote:

> I have a script running in the StatET Eclipse environment that
> executes the ggplot2 command qplot in a function:
> 
> # Creates the plot
> createPlot <- function(){
> print("Lets plot!")
> qplot(1:10, letters[1:10])
> }
> 
> When executing the qplot line directly, it works. When executing the
> script it does not open a window and it it does not plot. Is there
> something important I have forgotten? I know that the function is
> called because I always get my 'Lets plot'.... When using normal
> graphics plot functions, its also works seamless.
> 
> Of course I am importing the library ggplot2 at the beginning of my
> script - here is the import log:
> 
>  library(gdata)  # for trim function
> gdata: Unable to locate valid perl interpreter
> gdata:
> gdata: read.xls() will be unable to read Excel XLS and XLSX files
> gdata: unless the 'perl=' argument is used to specify the location of a
> gdata: valid perl intrpreter.
> gdata:
> gdata: (To avoid display of this message in the future, please ensure
> gdata: perl is installed and available on the executable search path.)
> gdata: Unable to load perl libaries needed by read.xls()
> gdata: to support 'XLX' (Excel 97-2004) files.
> 
> gdata: Unable to load perl libaries needed by read.xls()
> gdata: to support 'XLSX' (Excel 2007+) files.
> 
> gdata: Run the function 'installXLSXsupport()'
> gdata: to automatically download and install the perl
> gdata: libaries needed to support Excel XLS and XLSX formats.
> 
> Attaching package: 'gdata'
> 
> 
> The following object(s) are masked from package:utils :
> 
> object.size
> 
> Warning message:
> package 'gdata' was built under R version 2.10.1
>> library(TTR)  # for moving averages (SMA,...) smoothing
> Loading required package: xts
> Loading required package: zoo
> Warning messages:
> 1: package 'TTR' was built under R version 2.10.1
> 2: package 'xts' was built under R version 2.10.1
> 3: package 'zoo' was built under R version 2.10.1
>> library(ggplot2) # for plotting results
> Loading required package: proto
> Loading required package: grid
> Loading required package: reshape
> Loading required package: plyr
> Loading required package: digest
> 
> Attaching package: 'ggplot2'
> 
> 
> The following object(s) are masked from package:gdata :
> 
> interleave
> 
> Warning messages:
> 1: package 'ggplot2' was built under R version 2.10.1
> 2: package 'proto' was built under R version 2.10.1
> 3: package 'reshape' was built under R version 2.10.1
> 4: package 'plyr' was built under R version 2.10.1
> 5: package 'digest' was built under R version 2.10.1
> 
> 
> What is wrong here?
> 
> Ralf
> 
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