Created
June 6, 2016 16:49
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rle sequence replace
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| oi <- c(0,1,0,0,-1,0,0,1,0,-1,0,0,0,0,0,1,0,0,0,-1,0,0,0) | |
| cs <- cumsum(oi) | |
| # ^-- map: 0 1 1 1 0 0 0 1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0 | |
| # ^-- to: 0 1 1 1 0 0 0 2 2 0 0 0 0 0 0 3 3 3 3 0 0 0 0 | |
| (rle.cumsum.trickery <- function(mask) { | |
| rle1 <- rle(mask) | |
| x <- rle1$values | |
| rle1$values <- cumsum(x) * x | |
| inverse.rle(rle1) | |
| })(cs) | |
| # probably a nicer way with diff |
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