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Re: Removing some but not all spaces in a string [message #61757 is a reply to message #61755]

Tue, 29 July 2008 05:45

humanumbrella
Messages: 52
Registered: June 2008

Member

On Jul 29, 7:26 am, Jeremy Bailin <astroco...@gmail.com> wrote:
> On Jul 28, 10:41 pm, Craig Markwardt
>
>
>
> <craigm...@REMOVEcow.physics.wisc.edu> wrote:
>> wlandsman <wlands...@gmail.com> writes:
>>> I'm looking for suggestions for the best way remove the spaces around
>>> "operators" (e.g. <. > , =) in a string but not around other
>>> characters. For example, I want the string
>
>>> 'name = ngc 5548, v <15'
>
>>> to become
>
>>> 'name=ngc 5548, v<15'
>
>> I usually do specialized string twizzling at the byte level, which is
>> done in TEST2 below. I'm not sure if TEST2 faster or more elegant
>> than your TEST, but it avoids all the gluing and ungluing inherent in
>> the STREGEX() method. It's a pity there isn't a STREPLACE() which
>> handles regular expressions.
>
>> I also attached a version based on REPSTR() but since that sub-routine
>> itself does glue/unglue, it's just hiding the mess behind a facade.
>
>> Craig
>
>> pro test2, st
>> space = 32b
>> ops = '<>=' ;; Operations to delete spaces
>> bops = byte(ops)
>
>> st = strtrim(strcompress(st),2)
>> if st EQ '' then return
>
>> bb = byte(st)
>> mask = 0b
>> for i = 0, n_elements(bops)-1 do begin
>> mask = mask OR [(bb EQ space AND bb(1:*) EQ bops(i)),0b]
>> mask = mask OR [0b,(bb EQ bops(i) AND bb(1:*) EQ space)]
>> endfor
>
>> wh = where(mask EQ 0)
>> st = string(byte(bb(wh)))
>> return
>> end
>
>> pro test3, st
>> space = ' '
>> ops = ['<','>','='] ;; Operations to delete spaces
>
>> st = strtrim(strcompress(st),2)
>> if st EQ '' then return
>> for i = 0, n_elements(ops)-1 do begin
>> op = ops(i)
>> st = repstr(st, ' '+op, op)
>> st = repstr(st, op+' ', op)
>> endfor
>> return
>> end
>
>> --
>> ------------------------------------------------------------ --------------
>> Craig B. Markwardt, Ph.D. EMAIL: craigm...@REMOVEcow.physics.wisc.edu
>> Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
>> ------------------------------------------------------------ --------------
>
> I know this is a cheat, but I'm a firm believer in using the right
> tool for the job... and string manipulation is not IDL's.
>
> spawn, "echo '"+string1+"' | sed -e 's/ *\([<>=]\) */\1/g'", string2
>
> -Jeremy.

What if you take all spaces out and just put one back in after c
and , ??

Cheers,
--Justin

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[Message index]

		Re: Removing some but not all spaces in a string By: humanumbrella on Tue, 29 July 2008 09:09
		Re: Removing some but not all spaces in a string By: Craig Markwardt on Tue, 29 July 2008 08:43
		Re: Removing some but not all spaces in a string By: wlandsman on Tue, 29 July 2008 08:40
		Re: Removing some but not all spaces in a string By: Craig Markwardt on Tue, 29 July 2008 08:37
		Re: Removing some but not all spaces in a string By: humanumbrella on Tue, 29 July 2008 08:33
		Re: Removing some but not all spaces in a string By: David Fanning on Tue, 29 July 2008 08:27
		Re: Removing some but not all spaces in a string By: Bob[3] on Tue, 29 July 2008 08:16
		Re: Removing some but not all spaces in a string By: humanumbrella on Tue, 29 July 2008 05:45
		Re: Removing some but not all spaces in a string By: Jeremy Bailin on Tue, 29 July 2008 04:26
		Re: Removing some but not all spaces in a string By: Craig Markwardt on Mon, 28 July 2008 19:41

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