Hi to everybody!
I´m just a beginner in R, and I´m trying to replace values in a distance
matrix with a concret condition: replace all values (elements) lower than 4.5
with value=18.
I´ve tried this, but it doesn´t work...
Dxy would be my 117 x 117 euclidean distance matrix
M18 and M4.5 would be 117 x 117 matrices:
M18<-matrix(rep(18,13689),nrow=117)
M4.5<-matrix(rep(4.5,13689),nrow=117)
REPLACE ALL VALUES >4.5 WITH 18.0 in Dxy
for(i in 1:117) {
for(j in 1:117) {
Dxy[i,j]<-ifelse(Dxy[i,j]<M4.5[i,j],Dxy[i,j],M18[i,j])
}
}
Thanks in advance!
Mari Carmen Garcia
Ud. Anatomía, Fisiologia y Génetica.
Escuela Técnica Superior de Ingenieros de Montes de Madrid
Spain.
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