Problem 2351. Replace Nonzero Numbers with 1

Created by Vishal

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Given the matrix x, return the matrix y with non zero elements replaced with 1.

Example:

 Input  x =  [ 1 2 0 0 0
               0 0 5 0 0 
               2 7 0 0 0
               0 6 9 3 3 ]

 Output y is [ 1 1 0 0 0
               0 0 1 0 0 
               1 1 0 0 0
               0 1 1 1 1 ]

Solve

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Last Solution submitted on Jul 12, 2025

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eric landiech on 6 Jun 2014

>> isequal(NaN,NaN)
ans =
0

Therefore, the second test is inappropriate

Jan Orwat on 6 Jun 2014

isequaln should be used.

Jon on 6 Jun 2014

The way the problem is written, all nonzero elements, including NaN, should be changed to 1, but the test case doesn't work this way.

Ned Gulley on 6 Jun 2014

I updated the second test with isequaln so that NaN == NaN is true.

Stanislao Pinzón on 17 May 2020

It should be mentioned that 1 must be placed in the non-zero elements except for NaN.

Brianne Tengan on 12 Dec 2020

Replace all nonzero numbers with 1. Leave any NaN elements as NaN.

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Problem 2351. Replace Nonzero Numbers with 1

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Problem 2351. Replace Nonzero Numbers with 1

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Problem Recent Solvers413

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