[R] matrix looping accessing previous column
kasojim at battelle.org
Mon Dec 27 19:28:17 CET 2010
Thank you for the quick response :-). I've applied your suggestion to my
code, but I still receive an error:
> CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - 1] <-
> CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - 1] * -1
In Ops.factor(CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - :
* not meaningful for factors
I would like to perform this evaluation in a loop b/c my data matrix
actually contains 109 columns, and 32,000 rows.
More suggestions are appreciated!
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