try this:
A <- matrix(c(3,3,3,3,3,3,3,3,3),3,3)
B <- matrix(c(T,T,T,F,T,T,F,T,F),3,3)
C <- A
C[!B] <- NA
C
I hope it helps.
Best,
Dimitris
Andrej Kastrin wrote:
Dear all,
Suppose that I have a matrix A
A <- matrix(c(3,3,3,3,3,3,3,3,3),3,3)
and a logical matrix B
B <- matrix(c(T,T,T,F,T,T,F,T,F),3,3)
The result matrix should be
C <- matrix(c(3,3,3,NA,3,3,NA,3,NA),3,3)
Is there any simple tip or trick to perform this without looping?
Thanks in advance for any suggestion.
Best regards, Andrej
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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
