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st: MATA function that gives the TRUE indices of a logical object
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Subject
st: MATA function that gives the TRUE indices of a logical object
Date
Mon, 7 Feb 2011 16:53:47 +0100
Hello,
I have the following question on a function which a want to use in MATA. I think
it's best illustrated with an example. In the R-language you have the which()
function, which works as follows. Suppose you have a matrix Z:
0 0 0
1 0 0
0 1 0
9 9 1
9 9 9
9 9 9
then using which(Z==9, arr.ind = T)
finds entries with Z=9 and returns an array with coordinates as follows:
row col
4 1
5 1
6 1
4 2
5 2
6 2
5 3
6 3
Does a similar function exist in MATA?
regards Alex
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