Problem 307. First non-zero element in each column

For a given matrix, calculate the index of the first non-zero element in each column. Assuming a column with all elements zero is not permitted.
Example:
in->x = [0 1 0 0;
4 3 7 0;
0 0 2 6;
0 9 0 5];
out->i = [2 1 2 3]; % row numbers
Solve

Solution Stats

43.45% Correct | 56.55% Incorrect
Last Solution submitted on Jan 31, 2026

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matrix poor_test_suite

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