R help - Apr 2008 - Concatenate variables and quoted text for output filenames

I am outputting some graphs from SpatStat using a for loop.  I want the png
files to include the i and j from the nested loops in their names. For
example, I want the file names to look like "i-j_plot.png".  The code
is
below:

ma <- levels(marks(X))
 n <- length(ma)
  for(i in 1:n)
   for(j in 1:n)
   {
    png(filename=????)
    plot(envelope(X, Kcross, i=ma[i], j=ma[j]))
    dev.off()
   }
-- 
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29/04/2008 17:04 trhermes a ?crit
> I am outputting some graphs from SpatStat using a for loop.  I want the png
> files to include the i and j from the nested loops in their names. For
> example, I want the file names to look like "i-j_plot.png".  The
code is
> below:
> 
> ma <- levels(marks(X))
>  n <- length(ma)
>   for(i in 1:n)
>    for(j in 1:n)
>    {
>     png(filename=????)
>     plot(envelope(X, Kcross, i=ma[i], j=ma[j]))
>     dev.off()
>    }

  png(filename=sprintf("%d-%d_plot.png", i, j))

-- 
Best wishes
 Wolfgang

------------------------------------------------------------------
Wolfgang Huber  EBI/EMBL  Cambridge UK  http://www.ebi.ac.uk/huber