r - replacing next value with "1" -


i have matrix contains 1565 rows , 132 columns. observations either "0" or "1". want keep observations same 1 change, i.e whenever there "1", next value in same row should become "1". please see below sample:

>df  0    0    1    0    0 na    0    1    1    0  0    1    0    0    na

what want :

 0    0    1    1    0 na    0    1    1    1  0    1    1    0    na

i shall thankful help.

saba

one option using which arr.ind=true row/column index, add 1 column index, subset values , change 1.

i1 <- which(df==1, arr.ind=true) i1[,2] <- i1[,2]+1 df[i1] <- 1 df #     [,1] [,2] [,3] [,4] [,5] #[1,]    0    0    1    1    0 #[2,]   na    0    1    1    1 #[3,]    0    1    1    0   na

if there na elements adjacent 1 , want keep na, can modify above code with

df[i1] <- replace(df[i1], !is.na(df[i1]), 1)

data

df <- structure(c(0l, na, 0l, 0l, 0l, 1l, 1l, 1l, 0l, 0l, 1l, 0l, 0l,   0l, na), .dim = c(3l, 5l), .dimnames = list(null, null))

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