R help - Jun 2009 - ggplot2: How to export several plots with same width?

I have three plots and I want the *plot area* to be of the same width on
each plot.  Since the three plots have different legends, the text width
of the legend affects the width of the plot area (longer legend text narrower
plot area).  Exporting the three figures to postscript device
of same size gives thus unequal plot areas.  How can I calculate the
correct width of postscript device for each figure, so that plot areas
will be equally wide?

Is there a better alternative?

(I tried to place the legend inside the plot area, which kinda works, but
the problem is that legend.position is relative to the *device*, not to
the *plot area*, so I don' know how to align the legend with plot border.)

I'm not sure it's currently possible with ggplot2 (lattice and  
latticeExtra offer some workarounds for this).

Perhaps you can try this,

http://wiki.r-project.org/rwiki/doku.php?id=tips:graphics-ggplot2:sharelegend

(neater here: )

http://learnr.wordpress.com/2009/05/26/ggplot2-two-or-more-plots-sharing-the-same-legend/

except that in your case you'd have to place several legends.


HTH,

baptiste


On 1 Jun 2009, at 08:19, Zeljko Vrba wrote:
> I have three plots and I want the *plot area* to be of the same  
> width on
> each plot.  Since the three plots have different legends, the text  
> width
> of the legend affects the width of the plot area (longer legend text >
narrower plot area).  Exporting the three figures to postscript device
> of same size gives thus unequal plot areas.  How can I calculate the
> correct width of postscript device for each figure, so that plot areas
> will be equally wide?
>
> Is there a better alternative?
>
> (I tried to place the legend inside the plot area, which kinda  
> works, but
> the problem is that legend.position is relative to the *device*, not  
> to
> the *plot area*, so I don' know how to align the legend with plot  
> border.)
>
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