matrix or array composed by zero-values

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!

Answer 1

[Roger Stafford]

If M is the matrix or array, do:

 all(M(:)==0)

Answer 2

[David Sanchez]

try with

any(all(M))

any(all(M)) = 0 when every element of M equals 0

[Matz Johansson Bergström]

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.