Hi,
I have a (correlation) matrix and I want to select a subset of its cells
depending on the combination of their column and row names.
This illustrates my problem: mtrx <- matrix(c(1,2,3,4,5,6,7,8,9), nrow=3,
ncol=3, dimnames = list(c('c132','c432', 'c233'), c('r132','r233', 'r432')))>
mtrx r132 r233 r432c132 1 4 7c432 2 5 8c233 3 6 9
At this point I want to compute the mean of the cells in which the column and
the row names share the same suffix (i.e., the cells mtrx[1,1], mtrx[2,3],
mtrx[3,2]). By suffix I mean the last three digits of the row/col name.
I need a generic code (and not vec<-c(mtrx[1,1], mtrx[2,3], mtrx[3,2])) because
I don't know in advance how many rows and columns I will have (currently 118).
Thanks, Yoav
[[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.
