Array multiplication returning single value

Greetings,

I want AResult to be a 1x7 array but it keeps returning me a 1x1 value. I split the calculations on different variables (A1,A2,A3 Temp) so I can see it more cleary. I even tried the math on a calculator and the result was what I expected, an 7x1 array.

What am I missing?

Thanks!

EDIT: Well I am dumb, I read the equation wrong so the result was bound to be wrong. I identified my mistake and it was easy to fix.

XData = xlsread('MCP.xlsx');

X1   = XData(:,4)
X2   = XData(:,5)
X3   = XData(:,6)
X4   = XData(:,7)
X5   = XData(:,8)
X6   = XData(:,9)
Perq   = XData(:,10)            %Every X and the Perq variable are 209x9 arrays

Specs = [X1, X2, X3, X4, X5, X6];
Specs(:,7) = ones(length(XData),1)      %Irrelevant but I add a column of 1s at the end of Specs

A1Temp = transpose(Specs'*Perq)

A2Temp = Specs'

A3Temp = A1Temp * A2Temp

AResult = A3Temp * Perq

[Stephen23]

"What am I missing?"

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

Answer 1

[Torsten]

Specs ~ n x 7
A1Temp ~ 1 x 7
A2Temp ~ 7 x n
A3Temp ~ 1 x n
AResult ~ 1 x 1

[John Antwniou]

I need AResult to be 7 x 1 . I just can't figure it out. I keep geting 1x1 or nxn

[Torsten]

I can now arbitrarily manipulate your arrays for that you get a 7x1 result, but I think it should also make sense in the context.

Don't think about how you get AResult as 7x1 - think about what AResult represents in connection to the other arrays.

Answer 2

[Bruno Luong]

"What am I missing?"

Use elementwise multiplication ".*" and not matrix multiplication "*" (remove the double quote).