On Fri, Nov 16, 2012 at 2:42 PM, Khan, Sohail <skha...@nshs.edu> wrote:
> Thanks. But aggregate will work on rows or columns. I need to calculate > mean for subsets of rows in a matrix > I.E. > > Indx x1 x2 x3 x4 x5 x6 x7 x8 x9 > 1 25 30 15 8 12 9 18 21 89 > 2 52 35 42 74 65 20 28 32 12 > 3 12 35 33 88 12 52 32 32 18 > 4 25 25 16 23 89 21 21 21 42 > ........................................ > ................................... > I would like to calculate means for x1-x3, x4-x6, x7-x9 > For each row. > > matrix%*%kronecker(diag(6),rep(1/95,95))) assuming the original is set-up same as above (1-95 , 96 - 190 , ... -570) > -Sohail > > > -----Original Message----- > From: John Kane [mailto:jrkrid...@inbox.com] > Sent: Friday, November 16, 2012 4:35 PM > To: Khan, Sohail; 'r-help@r-project.org' > Subject: RE: [R] Calculateing means > > ?aggregate will do it. > > x <- data.frame( height= c(50, 174, 145, 200, 210, 140, 175), > age_group=c(1,2,2,1,1,2,1), > ville= c(1,2,3,1,2,3,1)) > > aggregate(x$height,list(x$age_group, x$ville), mean) > > or have a look at the plyr or datatable packages. > > John Kane > Kingston ON Canada > > > > -----Original Message----- > > From: skha...@nshs.edu > > Sent: Fri, 16 Nov 2012 15:58:17 -0500 > > To: r-help@r-project.org > > Subject: [R] Calculateing means > > > > > > Dear List, > > > > I have a data matrix with 570 columns containing 95 (samples) with 6 > > replicates each. > > How can I calculate the mean of the replicates for 95 samples? > > Thank you. > > > > > > The information contained in this electronic e-mail transmission and > > any attachments are intended only for the use of the individual or > > entity to whom or to which it is addressed, and may contain > > information that is privileged, confidential and exempt from disclosure > under applicable law. > > If the reader of this communication is not the intended recipient, or > > the employee or agent responsible for delivering this communication to > > the intended recipient, you are hereby notified that any > > dissemination, distribution, copying or disclosure of this > > communication and any attachment is strictly prohibited. If you have > > received this transmission in error, please notify the sender > > immediately by telephone and electronic mail, and delete the original > > communication and any attachment from any computer, server or other > > electronic recording or storage device or medium. Receipt by anyone > > other than the intended recipient is not a waiver of any > attorney-client, physician-patient or other priv! > > ilege. > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@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. > > ____________________________________________________________ > Send any screenshot to your friends in seconds... > Works in all emails, instant messengers, blogs, forums and social networks. > TRY IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if2 for FREE > > > > > The information contained in this electronic e-mail transmission and any > attachments are intended only for the use of the individual or entity to > whom or to which it is addressed, and may contain information that is > privileged, confidential and exempt from disclosure under applicable law. > If the reader of this communication is not the intended recipient, or the > employee or agent responsible for delivering this communication to the > intended recipient, you are hereby notified that any dissemination, > distribution, copying or disclosure of this communication and any > attachment is strictly prohibited. If you have received this transmission > in error, please notify the sender immediately by telephone and electronic > mail, and delete the original communication and any attachment from any > computer, server or other electronic recording or storage device or medium. > Receipt by anyone other than the intended recipient is not a waiver of any > attorney-client, physician-patient or other priv! > ilege. > ______________________________________________ > R-help@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. > [[alternative HTML version deleted]] ______________________________________________ R-help@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.
