Yes, that's better --- no looping at the interpreted level. Another version without transposing is:
nr <- 3 matrix(pmin(c(somematrix),rep(UB, e = nr)), nrow = nr) Both treat the matrix as a vector stored in column major order. Cheers, Bert On Wed, May 27, 2020 at 1:32 PM Mathew Guilfoyle <mrguilfo...@gmail.com> wrote: > A bit quicker: > > t(pmin(t(somematrix), UB)) > > > > On 27 May 2020, at 20:56, Bert Gunter <bgunter.4...@gmail.com> wrote: > > Jeff: Check it! > > somematrix <- matrix(c(1,4,3,6,3,9,12,8,5,7,11,11),nrow=3,ncol=4) > UB=c(2.5, 5.5, 8.5, 10.5) > apply( somematrix, 2, function( x ) pmin( x, UB ) ) > > [,1] [,2] [,3] [,4] > [1,] 1 2.5 2.5 2.5 > [2,] 4 3.0 5.5 5.5 > [3,] 3 8.5 5.0 8.5 > [4,] 1 6.0 10.5 7.0 > > Not what was wanted. > Am I missing something? > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along and > sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Wed, May 27, 2020 at 12:38 PM Jeff Newmiller <jdnew...@dcn.davis.ca.us> > wrote: > > Sigh. Transpose? > > apply( somematrix, 2, function( x ) pmin( x, UB ) ) > > On May 27, 2020 11:22:06 AM PDT, Bert Gunter <bgunter.4...@gmail.com> > wrote: > > Better, I think (no indexing): > > t(apply(somematrix,1,function(x)pmin(x,UB))) > > > Bert Gunter > > "The trouble with having an open mind is that people keep coming along > and > sticking things into it." > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) > > > On Wed, May 27, 2020 at 10:56 AM Rui Barradas <ruipbarra...@sapo.pt> > wrote: > > Hello, > > Try pmin. And loop by column/UB index with sapply/seq_along. > > > sapply(seq_along(UB), function(i) pmin(UB[i], somematrix[,i])) > # [,1] [,2] [,3] [,4] > #[1,] 1.0 5.5 8.5 7.0 > #[2,] 2.5 3.0 8.0 10.5 > #[3,] 2.5 5.5 5.0 10.5 > > > Hope this helps, > > Rui Barradas > > > Às 18:46 de 27/05/20, Michael Ashton escreveu: > > Hi - > > I have a matrix of n rows and 4 columns. > > I want to cap the value in each column by a different upper bound. > > So, > > suppose my matrix is > > > somematrix <- matrix(c(1,4,3,6,3,9,12,8,5,7,11,11),nrow=3,ncol=4) > > somematrix > > [,1] [,2] [,3] [,4] > [1,] 1 6 12 7 > [2,] 4 3 8 11 > [3,] 3 9 5 11 > > Now I want to have the maximum value in each column described by > UB=c(2.5, 5.5, 8.5, 10.5) > > So that the right answer will look like: > [,1] [,2] [,3] [,4] > [1,] 1 5.5 8.5 7 > [2,] 2.5 3 8 10.5 > [3,] 2.5 5.5 5 10.5 > > I've tried a few things, like: > newmatrix <- apply(somematrix,c(1,2),function(x) min(UB,x)) > > but I can't figure out to apply the relevant element of the UB list > > to > > the right element of the matrix. When I run the above, for example, > > it > > takes min(UB,x) over all UB, so I get: > > > newmatrix > [,1] [,2] [,3] [,4] > [1,] 1.0 2.5 2.5 2.5 > [2,] 2.5 2.5 2.5 2.5 > [3,] 2.5 2.5 2.5 2.5 > > I'm sure there's a simple and elegant solution but I don't know > > what it > > is! > > > Thanks in advance, > > Mike > > Michael Ashton, CFA > Managing Principal > > Enduring Investments LLC > W: 973.457.4602 > C: 551.655.8006 > Schedule a Call: https://calendly.com/m-ashton > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > > > -- > Sent from my phone. Please excuse my brevity. > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > <http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
