[R] problems with exporting a chart

[Uwe Ligges]

Please read the posting guide which asks you to answer basic questions 
such as:

Which R / lattice versions are we talking about?
Which is the "any" format?
Are you using the Devices directly or are you using some other way to 
copy contents of one device into another device?
What is the exact, minimal code (including data!) that reproduces your 
problem? It would be nice if we could copy and paste in it work on our 
machines.
Why do you call plot.new()?

Uwe Ligges




Elena Wilson wrote:
> Dear R helpers, 
> 
> I have a problem with exporting a chart (to any format). The graphic device becomes inactive and I get the 'Error: invalid graphics state' error message. I searched the help, web and FAQ but couldn't find the solution.
> 
> This is my code:
> I chart a histogram for differences in R2 by sample size (an extract from the data is below). Altogether I have n=2500 observations (n=500 per sample size)
> 
> Size; Delta_R2
> 60; 0.0073842 
> 60; 0.0007156 
> ...
> 70; 0.0049717
> 70; 0.0121892 
> ...
> 150; 0.0139615 
> 150; 0.0088114
> ...
> 250; 0.0027976
> 250; 0.0109080 
> ...
> 450; 0.0050917
> 450; 0.0088114
> ...
> 
> The histogram works ok and I can save  or copy to pdf/jpeg/png etc  with no problems
> 
> library(lattice)
> plot.new()
> histogram(~Delta_R2|as.factor(Size), type="percent", col="red", xlab="Delta OLS - SV R squared", main="R Squared Deviations")  
> 
> Once I put the legends (5 text boxes) on the chart and I try to save or copy it as pdf / jpeg/png etc I get the above mentioned error message.
> 
> This is the code for adding the legends:
> 
> 
> *The locations of the legends for each chart
> leg_loc=matrix(c( -0.1, 0.26,  0.62, -0.1, 0.26, 0.4, 0.4, 0.4, 1, 1),ncol=2, nrow=5, byrow=FALSE)
> 
> *Calculate the statistics for each sample size to display on the legends
> 
> for (i in 1:5) {
> nR=(i-1)*500+1
> nR2=nR+499 
> z=data[nR:nR2,13]
> 
> m<-mean(z)
> std<-sqrt(var(z))
> iqr=IQR(z)
> median=median(z)
> 
> *Adding to the chart
> 
> legend(leg_loc[i,1],leg_loc[i,2], legend= paste(
> "Mean=",round(m,3),'\n',
> "SD=",round(std,3),'\n',
> "Median =",round(median,3),'\n',
> "IQR=", round(iqr,3)),bty="n")
> }
> Do you know why it is happening? 
> Thank you in advance, 
> Lena
> 
> Elena Wilson
> DBM Consultants Pty Ltd
> 5-7 Guest Street, Hawthorn, Victoria 3122, Australia
> T: (61 3) 9819 1555
> www.dbmconsultants.com
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