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Re: convert very large string to numeric [message #36122 is a reply to message #36119]

Mon, 25 August 2003 14:31

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Mirko Vukovic wrote:

> Hello,
>
> I have a large two column matrix stored as a string, and I want to
> convert it to a two column float matrix.
>
> I've been using a rather convoluted method of flattening out the
> string matrix by replacing end-of-lines with spaces (having converted
> to byte array first), and then using ParseLine (from David F.'s web
> site) to get a vector of numbers:
>
>
> ByteBuffer = byte(self.CharBuffer)
> iSubs = where( (ByteBuffer eq 9b) or $
> (ByteBuffer eq 10b) or $
> (ByteBuffer eq 13b), cSubs)
> if cSubs ne 0 then begin
> ByteBuffer[iSubs] = 32b
> endif
>
> ... etc

Oh

why did you operate with bytes?

Ok we do it in some cases too.

I would suggest to use bytes2strarr
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/bytes2strarr_dbase.pro.html

to convert the bytes to a stringarray. This means it is not necessary to
convert 9b,10b,13b to 32b.

result is a string array.

From a string array it is easy to read by reads values from strings.

If you original have an ascii file I would suggest to use our
read_data_file.
It has two modes. default is table orientated with the /vstruct keyword you
can change it into column orientated.
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/read_data_file_dbase.pro.html

regards

Reimar

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email: R.Bauer@fz-juelich.de
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[Message index]

		Re: convert very large string to numeric By: mvukovic on Tue, 26 August 2003 09:42
		Re: convert very large string to numeric By: R.Bauer on Mon, 25 August 2003 14:31
		Re: convert very large string to numeric By: Paul Van Delst[1] on Mon, 25 August 2003 14:08
		Re: convert very large string to numeric By: Rick Towler on Wed, 27 August 2003 10:59
		Re: convert very large string to numeric By: Paul Van Delst[1] on Tue, 26 August 2003 09:59

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