On Thu, 13 Sep 2007, Abu Naser wrote:
Hello all R user,
I am very new with r I have been wondering whether anyone could help me.
I have a 23000 row and 273 colums. What I want to do is to calculate unit
vector for every
3 colums along the row. Could you please advise me how to do that using R?
A simple example might help us to understand what it is you want.
Do you wish to convert a 23000 by 273 matrix to a 23000*3 by 273/3 matrix?
If so and your matrix is 'x',
dim(x) <- c( 23000*3, 273/3 )
will do.
Do you wish to find the projection of the vector (1,1,1) onto each set of
x[ i, 1:3 + (j-1)*3 ]? Then
apply( array( x, dim=c(23000, 3, 273/3 ) ), c(1,3), mean )
seems like what you would want.
As is stated at the end of your email:
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html and provide commented,
minimal, self-contained, reproducible code.
This will make it more likely that readers of your message can help you.
with regards,
Abu
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
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