Exclude all records below specific row in R -


the data have contain 3 variable 3 unique ids , each has multiple records. see below 

id <- c(rep(1,7), rep(2,6), rep(3,5), rep(4,6)) t <- c(seq(1,7), seq(1,6), seq(1,5), rep(2,6)) y <- c(rep(6,7), rep(1,6), rep(6,5), rep(0.2,6)) z <- c(5,0,0,0,1,0,0,0,0,-1,0,0,0,4,2,nan,0,1,0,0,1,inf,inf, inf) dat1 <- data.frame(id, t, y, z)

for each id, if value of z below 0 (negative), nan, inf, or -inf, need exclude record , records below it.

for data, new processed data like:

id <- c(rep(1,7), rep(2,2), rep(3,2), rep(4,3)) t <- c(seq(1,7), seq(1,2), seq(1,2), rep(2,3)) y <- c(rep(6,7), rep(1,2), rep(6,2), rep(0.2,3)) z <- c(5,0,0,0,1,0,0,0,0,4,2,0,0,1) dat2 <- data.frame(id, t, y, z)

ave, group-by substitute. using cumsum counter identify subsequent rows deletion:

dat1[with(dat1, ave(z < 0 | (!is.finite(z)), id, fun=cumsum) == 0),]

quick check see match, exception of rownames not lining up:

all.equal(   dat2,   dat1[with(dat1, ave(z < 0 | (!is.finite(z)), id, fun=cumsum) == 0),],   check.attributes=false ) #[1] true

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