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convert very large string to numeric [message #36124]

Mon, 25 August 2003 13:58

mvukovic
Messages: 63
Registered: July 1998

Member

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

However, the ParseLine is rather slow for my large set of numbers. I
suspect the reason is that it uses rather pedestrian and string
oriented methods such as strpos and strmid.

Before I go and re-implement ParseLine by converting the string to a
byte type and using where's to delimit numbers, I was wondering
whether anyone might have done that already.

Thanks,

Mirko

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