how will this code take input in matrix form for scaler multiplication??

function b =check(Q)
Q(3:2)=zeros(3,2);
Qmd2=Q(3:2);
disp(Qmd2);
c=[1 2;1 3;1 4];
b=c.*Qmd2;
end

[John D'Errico]

I don't think anyone will have a clue, because it does some very strange things, that I think you don't understand either. For example, you use this:

Q(3:2)

in several places. I think you don't know what it does, because it does absolutely nothing, except that it will create an error where you use it.

In general, if Q is any scalar or matrix, then this line will cause an error, like this:

Q(3:2)=zeros(3,2)
In an assignment  A(:) = B, the number of elements in A and B must be the same.

The problem is the construct 3:2 produces an empty array. I.e., one with no elements at all. You cannot then stuff an array with 6 elements into something of size zero.

So the code that you show does nothing. Asking us how it will work is useless, since it won't work at all.

[Aimen Mujahid]

then how take input matrix for the multiplicaton with same dimension?

[John D'Errico]

You are making no sense at all. Sorry. As I pointed out, the code you have shown cannot ever run at all, for any input. Since I have no idea what you want it to do, I cannot give an answer to a question about the code, or how to change it.