I am new in R and I want to solve this problem; I have a matrix X (with n-rows and p-colums) my problem is to obtain the products of the vectors of rows and print out only the maximum value and identify the row that gives the maximum value. Thanks Oyeyemi, G.M --------------------------------- Don't pick lemons. [[alternative HTML version deleted]]
which.max(apply(mat, 1, prod)) Gabor On Wed, Jul 04, 2007 at 09:18:41AM -0700, Yemi Oyeyemi wrote:> I am new in R and I want to solve this problem; > I have a matrix X (with n-rows and p-colums) my problem is to obtain the products of the vectors of rows and print out only the maximum value and identify the row that gives the maximum value. Thanks > Oyeyemi, G.M > > > --------------------------------- > Don't pick lemons. > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch 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.-- Csardi Gabor <csardi at rmki.kfki.hu> MTA RMKI, ELTE TTK
Yemi, Try which.max(apply(X,1,prod)) (or possibly abs(apply(X,1,prod)) if you're only interested in unsigned product max. S>>> Yemi Oyeyemi <gmoyeyemi at yahoo.com> 04/07/2007 17:18:41 >>>I am new in R and I want to solve this problem; I have a matrix X (with n-rows and p-colums) my problem is to obtain the products of the vectors of rows and print out only the maximum value and identify the row that gives the maximum value. Thanks Oyeyemi, G.M --------------------------------- Don't pick lemons. [[alternative HTML version deleted]] ______________________________________________ R-help at stat.math.ethz.ch 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. ******************************************************************* This email and any attachments are confidential. Any use, co...{{dropped}}
Dear,
Thanks for your prompt assistant. The problem I posted is
just a bit of my problem. The whole problem is that;
1. I simulated a multivariate data set X (n by p)
2. Then draw sample without replacement from X (k less than n)
3. Compute the eigen values of the variance-covariance matrix of the sample
drawn
4. Store the eigen values in matrix eigenvals
5. Store the samples(that is the row identifier) drawn in rowvals
6. Bind the two matrices using rbind.
The problem is;
7. Now I want the print out of the maximum values of the eigenvalues product
and samples that give such maximum product.
Thanks
Oyeyemi Gafar M.
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