Re: [R] multiplication question

From: Henrique Dallazuanna <wwwhsd_at_gmail.com>
Date: Wed, 02 Jul 2008 18:04:03 -0300

I'm sorry:

sum(v1 %o% v2 - diag(v1*v2))

On Wed, Jul 2, 2008 at 6:03 PM, Henrique Dallazuanna <wwwhsd_at_gmail.com> wrote:

> Try something about like this:
>
> v1 %o% v2 - diag(v1*v2)
>
> On Wed, Jul 2, 2008 at 1:30 PM, Murali Menon <feanor0_at_hotmail.com> wrote:
>
>>
>> folks,
>>
>> is there a clever way to compute the sum of the product of two vectors
>> such that the common indices are not multiplied together?
>>
>> i.e. if i have vectors X, Y, how can i compute
>>
>> Sum (X[i] * Y[j])
>> i != j
>>
>> where i != j
>>
>> also, what if i wanted
>>
>> Sum (X[i] * Y[j] * R[i, j])
>> i != j
>>
>> where R is a matrix?
>>
>> thanks,
>>
>> murali
>>
>>
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>>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O

-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.

Received on Wed 02 Jul 2008 - 21:28:11 GMT

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