The key is that "Reduce" function -- it takes in a list of elements
and combines them iteratively, e.g., `+` is only defined for two
elements (at a time) but we can do something like
Reduce(`+`, list(1,2,3)) = Reduce(`+`, list(1+2,3)) = Reduce(`+`,
list(3,3)) = 3 + 3 = 6
Michael
On Tue, Mar 20
Hi Brian,
This works very well. Still trying to develop some skill with R. So can't say I
understand your function completely as yet, but will work on it. I had thought
that your function might only work for two columns (because of the
"function(x,y)" part), but the example below suggests it wi
On 3/17/2012 6:24 AM, Paul Miller wrote:
Hello All,
Need to coalesce some columns using R. Looked online to see how this
is done. One approach appears to be to use ifelse. Also uncovered a
coalesce function in the BBmisc, emoa, and microbenchmark packages.
Trouble is I can't seem to get it to w
Hi Michael,
So the coalesce functions don't do what I thought they did. I'll just use
ifelse() then unless anyone makes it clear I should do something different.
Thanks,
Paul
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I don't think any of these are doing what you want -- they just scan a
list of arguments for the first non-null argument (with some small
differences in implementation). They're more programming utilities
than data analysis tools. It sounds like it's going to be easier to
whip something up with ife
Hello All,
Need to coalesce some columns using R. Looked online to see how this is done.
One approach appears to be to use ifelse. Also uncovered a coalesce function in
the BBmisc, emoa, and microbenchmark packages.
Trouble is I can't seem to get it to work in any of these packages. Or perhaps
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