Hi,
I need to resample characters from a dataset that consists of an extremely
long string that is written over hundreds of thousands of lines, each of
length 50 characters. I am currently doing this by first inserting a space
after each character in the dataset and then using the following commands:
y <- as.matrix(read.table("data.txt"), stringsAsFactors=FALSE)
bstrap <- sample(length(y), 100000, TRUE)
write(y[bstrap], file="Rep1.txt", ncolumns=50, append=FALSE)
bstrap <- sample(length(y), 100000, TRUE)
write(y[bstrap], file="Rep2.txt", ncolumns=50, append=FALSE)
bstrap <- sample(length(y), 100000, TRUE)
.
.
.
and so on for 500 reps.
I think there should be a better way of doing this. My specific questions:
1. Is there a way to avoid inserting spaces between the characters before
calling the "sample" command (because I don't want spaces between the
resampled characters in the output either; see number 2 below)?
2. If I have no choice but to insert the spaces in my data before
resampling, is there a way to output the resampled data without spaces, but
simply as 50-character long strings one below the other)? I tried inserting
the following command: strip.white=TRUE in the write command line, but it
gave me an error as it did not understand the command.
3. Finally, since I have to get 500 such resampled reps from each dataset
(and there are over 20 such huge datasets) is there a way around having to
write a separate write command for each rep?
Any suggestions will be greatly appreciated.
Thanks,
S.
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