dear R experts---I am trying to replicate a perl feature. I want to be able to embed R commands inside a character string, and have the string be printed with the command executed. my perl equivalent is
my $a=10; my $teststring = "the expression, $a+1, is ::$a+1::, but add one more for ::$a+2::\n"; $teststring =~ s/::(.*?)::/$1/gee; print $teststring; of course, R does not use '$' for variable names. my ultimate goal is to write something like cat("d is a ::class(d):: with names ::names(d)::") of course, I know I can write this as cat("d is a", class(d), "with names", names(d)), but I also want to be define %or% so that I can write (is.data.frame(d)) %or% "d is a ::class(d):: with names ::names(d)::" ; operators don't take variable arguments afaik. :-(. advice appreciated. regards, /iaw ---- Ivo Welch (ivo.we...@gmail.com) ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.