I tried looking here https://www.mathworks.com/help/matlab/ref/find.html but nothing I tried is working, new to Matlab..
Finding first rightmost non-zero column of a matrix?
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Teresita Ramirez Aguilar
on 15 Aug 2019
Commented: Teresita Ramirez Aguilar
on 16 Aug 2019
How can I tell MATLAB to find the index of the RIGHTmost non-zero column of said matrix?
I found a similar question and answer for the leftmost column and it worked great! However, I am having trouble finding the rightmost column.
I need the leftmost column.
PLS&THANKYOU!
Accepted Answer
dpb
on 15 Aug 2019
Edited: dpb
on 15 Aug 2019
Same solution as the other except search from the other end...
find(any(A),1,'last')
I think Azzi's solution there doesn't find the column positionally but will find the column with the largest number of nonzero elements in it. So
[2 1
0 1
0 1]
with his would return 2, not 1 because three rows of second column return T but only one of column 1 will. But both have nonzero elements.
any() does the logical test by column for there being one or more nonzero elements so doesn't matter how many there are as long is one it'll show up. Then the find() locates either first or last depending on which direction you ask for with the optional argument.
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dpb
on 16 Aug 2019
I just noticed the "image" tag so that's a possibility...something inconsistent with the assumption matrix meant 2D array :)
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