Given a matrix of scalars, find the first occurrence of -1 in each column. Output NaN for a column which does not contain the value. For example
input =
0 0 0 0
-1 -1 0 1
-1 1 0 -1
0 0 0 1Find row number of first instance of -1 in each column
output = [2 2 NaN 3]
This solution is correct only if -1 is the only negative number in the matrix...
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