How to find product of any matrix A

I currently have the below as my function that I created to try and find the product of any matrix A. When I run the function, it keeps telling me that B is not inside any function. I don't know if I should change my function or what else I should do to fix the problem.

function prod=MatProd(A)
    prod=1;
    [m,n]=size(A);
    for i=1:1:m
        for j=1:1:n
            prod=prod*A(i,j);
        end
    end
end

B=[12.2, 1.2, 2.4; 2,3,4; 2.5, 6.2,3.4];
MatProd(B)

Answer 1

[the cyclist]

Put the function definition

function prod=MatProd(A)
    prod=1;
    [m,n]=size(A);
    for i=1:1:m
        for j=1:1:n
            prod=prod*A(i,j);
        end
    end
end

in a file named MatProd.m, and then call it using

B=[12.2, 1.2, 2.4; 2,3,4; 2.5, 6.2,3.4];
MatProd(B)

[Nicole Precourt]

When I input that code, if says MatProd "not enough input arguements. Error in MatProd (line 3) [m,n]=size(A);"

[the cyclist]

Are you sure you didn't call

MatProd()

instead of

MatProd(B)

?

That would give the error you are seeing.

If that's not the case, can you please be very specific about how you defined the function, and how you called it (e.g. from the command window, or from another function)?