MATLAB Function Reference    

Test for any nonzeros



B = any(A) tests whether any of the elements along various dimensions of an array are nonzero or logical true (1).

If A is a vector, any(A) returns logical true (1) if any of the elements of A are nonzero, and returns logical false (0) if all the elements are zero.

If A is a matrix, any(A) treats the columns of A as vectors, returning a row vector of 1s and 0s.

If A is a multidimensional array, any(A) treats the values along the first non-singleton dimension as vectors, returning a logical condition for each vector.

B = any(A,dim) tests along the dimension of A specified by scalar dim.



then B = (A < 0.5) returns logical true (1) only where A is less than one half:

The any function reduces such a vector of logical conditions to a single condition. In this case, any(B) yields 1.

This makes any particularly useful in if statements,

where code is executed depending on a single condition, not a vector of possibly conflicting conditions.

Applying the any function twice to a matrix, as in any(any(A)), always reduces it to a scalar condition.

See Also

all, logical operators, relational operators, colon

Other functions that collapse an array's dimensions include:

max, mean, median, min, prod, std, sum, trapz

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