http://imagej.273.s1.nabble.com/Manipulate-text-files-tp5005575p5005576.html
I'd recommend using pandas in python actually. You also probably could do
this in SQL, Perl or R. IMO, python pandas library will be the most
> Hi,
>
> I want to manipulate big tab-delimited text files, like extract specific
> columns, reorder them, generate new columns by simple calculations on
> existing columns, and generate a new text file from this.This is typically
> to translate data/results files obtained from various software, from one
> format to another.
>
> What is the most efficient to do this in IJ Javascript? For the moment I
> import the whole text file as a string, make an array from it (parsing the
> numerical values), manipulate the array, convert it back to a big string,
> and save it. But for text files with 10^5-10^6 lines it takes ages to
> process. Is it possible to read/write line by line from the input file to
> the output file using IJ Javascript?
>
> Alternatively, I'd be open to suggestions for using other than IJ
> Javascript to do that, as it is not really image processing.
>
> Thanks for your help,
>
>
> Christophe
>
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