How to solve the concatenation error in matrix?

I have a linear system Gm=d and I want to add equality constraints to this system in the form

Fm=h ; to solve at the end this system

[G'G F';F 0][m;lamda]=[G'd;h]

Where:-

G: 13×52; d: 13×1; m: 52×1; lamda: 1×1;

F: 52×52; h: 52×1;

OR:

F:13×52; h: 13×1

[James Tursa]

Can you post the actual code you are using? And copy&paste the entire error message along with the offending line noted?

[Matt J]

Could you not simply use lsqlin?