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Problem 307. First non-zero element in each column

Created by Julio

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                                      

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97 correct solutions 54 incorrect solutions
Last solution submitted on Dec 06, 2014

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