MATLAB: Problem in linsolve , the equation on the left side not accepted

Question

Hi All

I am defining equation as :

M_num = – (19*c2)/4 – (11*c3)/18 – 50 ;

M_n2 = – 7*c2 – (5*c3)/18 – 50 ;

then I have :

 linsolve({M_num = 0, M_n2 = 0}, {c2, c3}) ;

and I get the error :

Error: The expression to the left of the equals sign is not a valid target for an assignment.

WHY ??

Answer 1

Farzad - see the documentation for linsolve. If you are trying to solve the system of equations Ax=B, then you need to define your A and B with two unknowns of c2 and c3, then you should try something like

 A = [-19/4 -11/18 ; -7 -5/18];
 B = [50 ; 5];
 X = linsolve(A,B);