[R] cex multiplier not exact

[Uwe Ligges]

On 23.10.2011 22:33, Ali Tofigh wrote:
> Hi,
>
> When I plot text and use cex to change the text size, I notice that the cex
> multiplier is not exact. It looks as if the real size of text can take only
> certain discrete values. Is there a workaround to get text to follow the cex
> value more closely, or at least to be able to figure out what the real cex value
> will be?

Typically this is multiplied by the default pointsize of the current 
device and rounded to an integer - the resulting pointsize that you see 
with your code.

If you want to know it absolute precisely: This may even depend on the 
device and I think you will have to read the source code in order to 
find out how it is actually implemented for your current device (which 
you have not even stated).

Uwe Ligges


>
> Here is an example that illustrates the problem:
>
> cex<- seq(0.5, 1, 0.01)
> x<- 0.05
> y<- (1:length(cex))/length(cex)
> labels<- paste("XXXXXX", cex)
> plot.new()
> text(x=x, y=y, labels=labels, pos=4, cex=cex)
>
> /Ali
>
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