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Author Topic: trying to understand the difference  (Read 1504 times)

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cadman6735

  • Guest
trying to understand the difference
« on: May 14, 2013, 02:42:50 PM »
What is the difference?

Code: [Select]
(ssget "x" '((2 . "BLOCKNAME")))   ;works
(ssget “x” (list  (cons 2 “BLOCKNAME”)))    ;works
Code: [Select]
(setq *value* "BLOCKNAME")

(ssget "x" '((2 . *value*)))   ;does not work   <------  why does this not accept variables?
(ssget “x” (list  (cons 2 *value*)))    ;works
Thanks
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dgorsman

  • Water Moccasin
  • Posts: 2437
Re: trying to understand the difference
« Reply #1 on: May 14, 2013, 03:13:31 PM »
The single quote is essentially saying "use this as is", so it is literally ((2 . *value*))) not the value you are trying to pass.  If you want to dynamically change the condtions, you will need to manually construct the list with calls to (list ...) and (cons ...).
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   catch (notResponsible)
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cadman6735

  • Guest
Re: trying to understand the difference
« Reply #2 on: May 14, 2013, 03:18:17 PM »
Thank you
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Tharwat

  • Swamp Rat
  • Posts: 710
  • Hypersensitive
Re: trying to understand the difference
« Reply #3 on: May 14, 2013, 03:19:45 PM »
No evaluation or expression after the quote symbol ( ' ) in other words , it is a dummy expression or static one .
Hope this helps .
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Lee Mac

  • Seagull
  • Posts: 12914
  • London, England
Re: trying to understand the difference
« Reply #4 on: May 14, 2013, 03:46:49 PM »
Maybe this explanation will also shed some light on the topic:

http://www.cadtutor.net/forum/showthread.php?75708&p=513602&viewfull=1#post513602
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cadman6735

  • Guest
Re: trying to understand the difference
« Reply #5 on: May 14, 2013, 04:59:48 PM »
Yes, I understand now,
Thank you all...
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cadman6735

  • Guest
Re: trying to understand the difference
« Reply #6 on: May 14, 2013, 05:09:24 PM »
lee, your link, very informative and easy to understand... thanks
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Lee Mac

  • Seagull
  • Posts: 12914
  • London, England
Re: trying to understand the difference
« Reply #7 on: May 14, 2013, 05:26:38 PM »
Quote from: cadman6735 on May 14, 2013, 05:09:24 PM
lee, your link, very informative and easy to understand... thanks

Excellent, thanks  8-)
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