Force get 3*4 matrix

Hello, I want force user input exactly 3*4 matrix. other size is unacceptable.

Answer 1

[James Tursa]

x = the user input
if( ~isequal(size(x),[3 4]) )
    error('Size must be exactly 3x4')
end

[Guillaume]

or

validateattributes(x, {'numeric'}, {'size', [3 4]})

[James Tursa]

+1 Guillaume