R help - Jan 2003 - problems writing graphics

Hello R-listers,

I am developing a function which needs to create jpeg files from some plots. To
create the jpeg files I use the instruction dev.print(jpeg,
file=c://graph.jpg",width=400,height=400). Until now everything has been
fine, but now I have a special plot which is formed by 3 separate plots joined
with the instruction "layout":

nf <- layout(matrix(c(2,0,1,3),2,2,byrow=TRUE), c(3,1), c(1,3), TRUE);
layout.show(nf);


The graphic in R is ok, but the problem comes when I try to change the size of
the graphic in the function dev.print, as it seems to not expand the layout
graphic to the size I have chosen (it creates an image with the right size, but
expanding the margins and not the image itself, while with "normal"
plots the image is expanded). Anyone could tell me how to change the size of the
image?

Thank you in advance,

Juan

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Juan Ramon Gonzalez wrote:
> Hello R-listers,
> 
> I am developing a function which needs to create jpeg files from some
plots. To create the jpeg files I use the instruction dev.print(jpeg,
file=c://graph.jpg",width=400,height=400).
[won't work anyway]

Until now everything has been fine, but now I have a special plot which 
is formed by 3 separate plots joined with the instruction
"layout":
> 
> nf <- layout(matrix(c(2,0,1,3),2,2,byrow=TRUE), c(3,1), c(1,3), TRUE);
> layout.show(nf);
> 
> 
> The graphic in R is ok, but the problem comes when I try to change the size
of the graphic in the function dev.print, as it seems to not expand the layout
graphic to the size I have chosen (it creates an image with the right size, but
expanding the margins and not the image itself, while with "normal"
plots the image is expanded). Anyone could tell me how to change the size of the
image?
> 
> Thank you in advance,
> 
> Juan
Use dev.copy() instead (it redraws the figure, see ?dev.copy), or even 
better use the jpeg() device directly, if you are on Windows.

Uwe Ligges