Re: [R] row sum question

Assuming DF is a data frame like this: DF <- data.frame(V1 = c(1, 0, 1, 0), V2 = c(1, 1, 1, 1), V3 = c(0, 1, 1, 1), V4 = c(0, 0, 0, 1)) # try this: head(rowSums((rbind(0, cummax(DF)) < rbind(cummax(DF), 0))), -1) On Sun, Dec 21, 2008 at 8:36 PM, Keun-Hyung Choi wrote: > Dear helpers, > >

[R] row sum question

Dear helpers, I'm using R version 2.8.0. Suppose that I have a small data set like below. [,1] [,2] [,3] [,4] a1100 b0110 c1110 d0111 First, I'd like to find sum of each row uniquely present in each row, but only sequentially f

Re: [R] row sum question

Will this do it for you: > nrows <- 10 > ncols <- 10 > mat <- matrix(sample(0:1, nrows * ncols, TRUE), nrow=nrows, ncol=ncols) > mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,]101110000 0 [2,]000000011

[R] row sum question

Dear helpers, I'm using R version 2.8.0. Suppose that I have a small data set like below. [,1] [,2] [,3] [,4] a1100 b0110 c1110 d0111 First, I'd like to find row sum of values uniquely present in each row, but only sequen