You might be interested in package "bit".
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Sent from my phone. Please excuse my brevity.
"Jonas Jägermeyr" <jonas...@pik-potsdam.de> wrote:
>Dear R-help members,
>
>I'm processing a large amount of MODIS data where quality assessment
>information is stored as an integer value for each pixel. I have to
>converted this number to an 8 digit binary flag to get access to the
>stored quality code (e.g. in2bin(165,8) = 1 0 1 0 0 1 0 1).
>
>Unfortunately, I did not manage to find a package providing a fast
>function to do so. I need to run this on millions of pixels and thus
>wrote the following function.
>
>int2bin <- function(x,ndigits){
> base <- array(NA, dim=c(length(x), ndigits))
> for(q in 1:ndigits){
> base[, ndigits-q+1] <- (x %% 2)
> x <- (x %/% 2)
> }
> bin<- apply(base,1,paste,collapse="")
> return(bin)
>}
>
>Since it is still slow, I have to find a way to express this more
>elegantly. I'd really appreciate any help.
>
>Thanking you, with best regards
>
>Jonas J�germeyr
>
>Potsdam Institute for Climate Impact Research
>Research Domain II
>
> [[alternative HTML version deleted]]
>
>______________________________________________
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
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