Re: mean of 2 unequal matrices

[Ben Abbott]

On Jun 7, 2009, at 7:36 AM, Huub van Niekerk wrote:

> Hi,
>
> I have 2 matrices: A: 200x1 and B: 300x1. I want to calculate the  
> mean of the combined data but when I do mean_all = mean(A + B) I get  
> these mesages because the matrices aren't of the same dimensions.:
>
> >mean_all = mean(A + B);
> error: operator +: nonconformant arguments (op1 is 200x1, op2 is  
> 300x1)
> error: evaluating binary operator `+' near line 12, column 28
> error: evaluating argument list element number 1
> error: evaluating assignment expression near line 12, column 10
>
> How can I accomplish this? By adding the means of A and B?


A + B is addition. You want a union.

mean_all = mean (union (A, B));

Ben