Any one give me an example for false output in ismatrix.

I wondering if anyone point out a input which gives false output for ismatrix

Answer 1

[Matt J]

    >> ismatrix(rand(3,3,3))

    ans =

         0

As more exotic example,

>> ismatrix(myclass)

ans =

       0

where myclass is defined as follow,

    classdef myclass 

        methods

            function sz=size(obj)
                sz=1;
            end

        end
     end

[Stalin Samuel]

I understand the second example.But may i know why it is false in the first example

[Matt J]

Because a 3D array, X, is not a matrix. size(X) returns a vector that is not 1x2.

[Matt J]

From the help doc for ismatrix

    ismatrix(M) returns logical 1 (true) if SIZE(M) returns [m n] 
    with nonnegative integer values m and n, and logical 0 (false) otherwise.

[Stalin Samuel]

Thanks dear

Answer 2

[the cyclist]

M = zeros(2,3,5)
ismatrix(M)

[Stalin Samuel]

Thanks for your instant reply