Plotting from functions

On 01/06/2011 4:06 PM, Yang Zhang wrote:

On Wed, Jun 1, 2011 at 1:04 PM, Yang Zhang<yanghatespam at gmail.com>  
wrote:

I can plot to png's fine when i run this directly from the top-level
script/console:

png('diamonds.png');qplot(carat,price,data=diamonds);dev.off()

But for some reason it's not working when that's in a function:

(function(){png('diamonds.png');qplot(carat,price,data=diamonds);dev.off()})() 


I suspect this is because the qplot's return value must be "returned"
to the top-level, because this works:

(function(){png('diamonds.png');qplot(carat,price,data=diamonds)})();dev.off() 


Any hints on how I can plot from within a function?  Thanks in advance.

Actually, just found that things work if I do:

print(qplot(...))

Is this just what you need to do to plot from within functions?

If the plotting function is using grid graphics you do.  I don't know 
where the qplot() function is from, but it looks as though it must be 
from a package that uses grid.

Duncan Murdoch

_