[R] readBin which has two different sizes

[Ab Hu]

Henrik Bengtsson wrote:
> 
> 
> 1. Use x <- readBin(..., what="raw", n=35269*(54*4)) to read your raw
> ("byte") data.
> 2. Turn it into a 54x4x35269 array, e.g. dim(x) <- c(54,4,35269).
> 3. Extract the 4-byte time stamps by yT <- x[1:4,,,drop=FALSE];  This
> is of type "raw".  Use readBin() to parse it, i.e. zT <- readBin(yT,
> what="integer", size=4, signed=TRUE, endian="big").  There are your
> timestamps.
> 4. Extract the 50 1-byte samples by yS <- x[5:54,,,drop=FALSE];  zS <-
> readBin(yS, what="integer", size=1, signed=FALSE);
> 
> Something like that.
> 
> /Henrik
> 
Tried it and it works great. I had to make just one adjustment, i.e. specify
the size of n, which I did using length:

yT <- x[1:4,,,drop=FALSE]
zT <- readBin(yT, what="integer", size=4, n=length(yT), signed=FALSE,
endian="big")

yS <- x[5:54,,,drop=FALSE];  
zS <- readBin(yS, what="integer", size=1, n=length(yS), signed=TRUE)

Thanks Henrik!


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