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Re: mean of 2 unequal matrices


From: John W. Eaton
Subject: Re: mean of 2 unequal matrices
Date: Sun, 7 Jun 2009 08:50:01 -0400

On  7-Jun-2009, Ben Abbott wrote:

| 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));

Won't union throw out duplicate values?  Maybe you want

  mean  ([A; B])

?

jwe


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