how do i solve matrix error dimensions here

Hello

Can anyone help me with this code

I don't know what's wrong about it, or how can i solve it.

I want to find P in this question

and this is my code

k=-0.8146;T=0.1268;
M = [k, T, 0, 0 ;
    T, k, T, 0 ;
    0, T, k, T ;
    0, 0, T, -0.6878];
 
J=[-4126.78;-3365.98;-3215.98;-3365.98];
J/M

Answer 1

[Image Analyst]

Try this:

k=-0.8146;
T=0.1268;
M = [k, T, 0, 0 ;
    T, k, T, 0 ;
    0, T, k, T ;
    0, 0, T, -0.6878] 
J = [-4126.78;-3365.98;-3215.98;-3365.98]
p = inv(M) * J
% Double check
pVerify = M * p %  Should equal J or be very very close.