dear R wizards---I am not sure at what point I owe pennance for asking
so many questions. I am now wrangling debugging. I want to write a
function
assert = function( condition, ... ) {
if (!condition) {
cat(...); cat("\n");
browser();
}
stopifnot(condition);
}
assert( nrow(ds)==12, "My data set has ", nrow(ds), ", rows which is a
bad error.");
(Please ignore my semicolons.) Then, having invoked "browser()", I
would like by hand to be able to move back up one stack frame so that
I can look at my variables there. Alas, two "little" problems.
First, the cat() does not seem to work. It prints the arguments
themselves, rather than 'nrow(ds)'. Second, I have no idea how to
move up one stack frame to the calling function so that I can examine
better what went wrong. Is this possible?
As always, advice is highly appreciated.
Regards,
/ivo
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