How to solve Ax=b where A is a rectangular matrix for higher order in matlab

How to solve Ax=b

Where and b=

Answer 1

[Matt J]

x=A\b

[Matt J]

Boni_Pl's comment moved here:

If A and b is a complex matrix then also A\b will give a exact result??

[Matt J]

A\b will give an exact solution if an exact solution exists. It doesn't matter if A and b are complex.

[Bruno Luong]

In any case A\b provides x "a" least-square solution, i.e., it minimizes

norm(A*x-b).

If solution exists then the minimum is 0, meaning A*x matches exactly b (up to numerical precision error).