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Editorial Team
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Asked: 2026-05-23T11:55:53+00:00

Given a matrix: [,1] [,2] [1,] 0 0.0 [2,] -1 0.8 What is the

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Given a matrix:

      [,1] [,2]
[1,]    0  0.0
[2,]   -1  0.8

What is the quickest way in R to iterate over the matrix and return the position of all non-zero entries as an index?

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1 Answer

  1. Editorial Team

    Here is one approach

    mat = matrix(rnorm(9), 3, 3)
which(mat !=0, arr.ind = T)
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