matrix or array composed by zero-values

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Hi, is it present a native matlab command able to verify if a matrix, or an array, given as input is only composed by zero-values? Often i use the find function with the condition matrix == 0 and then i check if the results of find function is equal to the length of the input matrix or array. Thank you!

Accepted Answer

Roger Stafford
Roger Stafford on 15 Jul 2014
If M is the matrix or array, do:
all(M(:)==0)

More Answers (1)

David Sanchez
David Sanchez on 15 Jul 2014
try with
any(all(M))
any(all(M)) = 0 when every element of M equals 0
  1 Comment
Matz Johansson Bergström
Matz Johansson Bergström on 15 Jul 2014
Don't you mean all(all(M)) for a 2D matrix M?
Because
M=zeros(3); M(3,3)=1; any(all(M))
and
M=zeros(3); any(all(M))
gives the same answer, which is 0.
all returns 1 if all elements of a vector is non-zero. 'Any' returns 1 if any element of a vector is non-zero.
any( all(M) ) will return 1 if at least one of the columns of M is non-zero and 0 otherwise.

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