Hello, I was trying to replace some values in a data matrix using their index as a reference by NA. Say i have the following data matrix mydata 1 2 3 4 1 6 2 3 4 5 6 6 3 5 6 2 7 0 and i have also myindices 1 2 1 5 3 5 that refers to the data values above, for example 1 2 means that row 1 and column 2, that has a value of 2 in mydata, 1 5 means the value 1 in the first row and 5th col. I want to replace those index values as in "myindices" from "mydata" by NA's. Is there anyone who can suggest me as to how to do this, please? Thank you Daniel [[alternative HTML version deleted]]

> mydata [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 2 3 4 1 6 [2,] 2 3 4 5 6 6 [3,] 3 5 6 2 7 0 > myindices [,1] [,2] [1,] 1 2 [2,] 1 5 [3,] 3 5 > mydata[myindices] <- NA > mydata [,1] [,2] [,3] [,4] [,5] [,6] [1,] 1 NA 3 4 NA 6 [2,] 2 3 4 5 6 6 [3,] 3 5 6 2 NA 0 On Sat, Feb 12, 2011 at 7:09 AM, Daniel M. <danielmessay at="" yahoo.com=""> wrote: > Hello, > > I was trying to replace some values in a data matrix using their index as a > reference by NA. > Say i have the following data matrix > > mydata > > 1 2 3 4 1 6 > 2 3 4 5 6 6 > 3 5 6 2 7 0 > > and i have also > myindices > 1 2 > 1 5 > 3 5 > > that refers to the data values above, for example 1 2 means that row 1 and > column 2, that has a value of 2 in mydata, 1 5 means the value 1 in the first > row and 5th col. > > I want to replace those index values as in "myindices" from "mydata" by NA's. > > Is there anyone who can suggest me as to how to do this, please? > > Thank you > > Daniel > > > > > ? ? ? ?[[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at r-project.org > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > -- Matthew N McCall, PhD 112 Arvine Heights Rochester, NY 14611 Cell: 202-222-5880