4x5 Matrix solution C=B/A receiving four solutions

I have inputted this matrix:

A = [1 8 9 2

    2 7 8 3

    3 5 7 4

    4 1 6 5];
or
A = [1 8 9 2;2 7 8 3;3 5 7 4;4 1 6 5];

with:

B = [11;12;13;14];

C = B/A

error code:

??? 4x5 Matrix | Error: Missing MATLAB operator.

Answer 1

[Roger Stafford]

The error message is certainly misleading. The problem is that if A is 4-by-4 and B is 4-by-1, the expression C = B/A is invalid. You are asking that matrix C satisfy the equation

 C*A = B

but whatever C is, C*A must have four columns and yet B has only one column, so it is an impossible request.

Answer 2

[Philosophaie]

I am having a syntax error in the 4x4 array "A".

What am I entering wrong?

[Roger Stafford]

My version of matlab doesn't complain, but yours might object to what appears in this text to be a blank line between the first line and the rest of the A matrix input. Or perhaps it wants semicolons after each row. I still don't understand that error message. It is as though you had a fifth number entered in the first line.

My comment about the error in B/A still holds.

[Philosophaie]

Yes it is X = A\B for A*X = B not B/A.

I want to make an m-file of this process.

This is probably why it was not working.

Answer 3

[Disha]

A = [= [1.1 0 2.1 -3.5 6;0 1.1 -6.6 2.8 3.4;2.1 0.1 0.3 -0.4 1.3;-1.4 5.1 0 1.1 0]