[R] How to index the occasions in a vector repeatedly under condition 1? if not, it will give a new index.
wdun|@p @end|ng |rom t|bco@com
Wed Feb 19 16:22:43 CET 2020
Use cumsum(logicalVector) to increment a counter at the TRUE positions in
logicalVector. . E.g.,
> d <- c(NA, 0, 0, 0, 8, 0, 577, 69, 0)
> is_true <- function(x) !is.na(x) & x
> 1 + cumsum( is_true(d >= 15) )
 1 1 1 1 1 1 2 3 3
Some packages have the equivalent of that is_true function, which maps
FALSE and NA to FALSE and TRUE to TRUE. I don't think core R contains such
On Wed, Feb 19, 2020 at 7:08 AM Lijun Zhao <lijun.zhao using adelaide.edu.au>
> Dear all,
> Could you please help me how to get the output as I described in the
> following example?
> x<-c(543, 543, 543, 543, 551 , 551 ,1128 ,1197, 1197)
>  NA 0 0 0 8 0 577 69 0
> How to index the occasions in x repeatedly if the diff<15? if diff>=15, it
> will give a new index.
> I want the output be like y.
> Thank you so much,
> Lijun Zhao (PhD Candidate)
> Nutrition and Metabolism
> Level 7 SAHMRI
> North Terrace
> Adelaide 5005
> Ph : +61 8 8128 4898
> e-mail: lijun.zhao using adelaide.edu.au<mailto:lijun.zhao using adelaide.edu.au> or
> lijun.zhao using sahmri.com<mailto:lijun.zhao using sahmri.com>
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