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matrix or array composed by zero-values

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Francesco
Francesco 2014-7-15
评论： Matz Johansson Bergström 2014-7-15
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!

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采纳的回答

Roger Stafford
Roger Stafford 2014-7-15
If M is the matrix or array, do:
all(M(:)==0)

更多回答（1 个）

David Sanchez
David Sanchez 2014-7-15
try with
any(all(M))
any(all(M)) = 0 when every element of M equals 0
  1 个评论
Matz Johansson Bergström
Matz Johansson Bergström 2014-7-15
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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