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Re: Null terminated strings [message #28812 is a reply to message #28738]

Thu, 10 January 2002 06:57

Struan Gray
Messages: 178
Registered: December 1995

Senior Member

Craig Markwardt, craigmnet@cow.physics.wisc.edu writes:
> Struan Gray <struan.gray@sljus.lu.se> writes:
>> James Kuyper, kuyper@gscmail.gsfc.nasa.gov writes:
>>
>>> I'm still wonder how to best convert a null-delimited
>>> list of strings into an IDL string array
>>
>> Sounds like a job for supersonic HISTOGRAM and his
>> ever-eager sidekick REVERSE_INDICES.
>
> That's a good idea, although I think you can't avoid a FOR loop. In
> fact, it is my belief that by using REVERSE_INDICES to look at more
> than one bin in a histogram, you are *guaranteed* to use a FOR loop or
> equivalent.

Aahh. But in this case, you are only going to look at
one bin, and the first one at that - which avoids the usual
problem of having to step through the REVERSE_INDICES array.
I haven't tried it, but it might even be possible to force
Histogram to construct a histogram with just one bin. Then
you're laughing.

Of course, this is much the same as using where(),
except that as those who have read the HISTOGRAM
documentation know, it's faster doing it the non-obvious
way.

Mind you, on further reflection, I would probably just
adapt Malcolm Walters' idea to use array compares, which
in theory at least should be faster than either HISTOGRAM or
WHERE.

btext = byte(text)
btext = btext + 10B*(btext < 1B)
textarr = strsplit(string(btext), string(10B), /extract)

Struan

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[Message index]

		Null terminated strings By: James Kuyper on Mon, 07 January 2002 10:11
		Re: Null terminated strings By: Craig Markwardt on Wed, 09 January 2002 15:43
		Re: Null terminated strings By: James Kuyper on Wed, 09 January 2002 06:19
		Re: Null terminated strings By: Struan Gray on Thu, 10 January 2002 06:57
		Re: Null terminated strings By: Malcolm Walters on Wed, 09 January 2002 02:26
		Re: Null terminated strings By: Struan Gray on Wed, 09 January 2002 00:29
		Re: Null terminated strings By: James Kuyper on Tue, 08 January 2002 12:58
		Re: Null terminated strings By: Craig Markwardt on Tue, 08 January 2002 11:51
		Re: Null terminated strings By: thompson on Tue, 08 January 2002 09:17
		Re: Null terminated strings By: Jaco van Gorkom on Tue, 08 January 2002 08:17

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