#M1 = first matrix #M2 = second matrix M2[M1==0]<-NA
----- Original Message ----- From: "ISAIAH SHALWITZ" <[EMAIL PROTECTED]> To: <r-help@stat.math.ethz.ch> Sent: Tuesday, August 16, 2005 5:00 AM Subject: [R] Conditional Matrices > This seems like a simple problem but I can't figure it out: > > I have two identical DIMENSION matrices. Both contain only binary values > NOT identical between matrices. What I want to do: If in cell (1,1) the > value in the first matrix (x) equals 1, then I keep the value in cell > (1,1) in the second matrix (y). If in cell (1,1) the value in the first > matrix (x) equals 0, then I change the value in cell (1,1) in the second > matrix (y)to missing (NA). Repeat for every pair of cells (coordinates of > the paired cells always match). > > Please help. > > I > > ______________________________________________ > R-help@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 ______________________________________________ R-help@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