[R] Concatenate variables and quoted text for output filenames

From: trhermes <trhermes_at_gmail.com>
Date: Tue, 29 Apr 2008 09:04:30 -0700 (PDT)

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)

    plot(envelope(X, Kcross, i=ma[i], j=ma[j]))     dev.off()

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