classify a matrix according to a "flag" value
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Hello
I have a rather large matrix with 3 columns and several thousand rows (!) (1000000x3)
As example
c1 c2 c3
r1 10 -5 0
r2 20 -10 1
.. ... ... 0
rn 100 -1 0
I would like to set as my criterion the third column, if the number is 0 then collect all the information from the other two column and create a new matrix.
c1 c2 c3
r1 10 -5 0
r2 ... ... 0
rn 100 -1 0
any suggestions? thank you very much
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