limitations to a real
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Category: EN
Forum Name: AutoCAD
Forum Description: Discussion about AutoCAD and AutoCAD LT, viewers, DWG and DWF formats, Design Review, AutoCAD 360, add-ons
URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=4905
Printed Date: 17.Apr.2026 at 17:22
Topic: limitations to a real
Posted By: XPeter61
Subject: limitations to a real
Date Posted: 04.Dec.2010 at 17:43
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Replies:
Posted By: HAWDesigner
Date Posted: 13.Dec.2010 at 22:45
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All I can say is the system isn't perfect. LISP is a very old language and relied upon many many different factors that probably aren't in place with any of today's technology. Good Luck!! ------------- -- R. Williams AutoCAD 2010 Certified Professional <!-- If all else fails hit F1 --> <<AutoCAD 2009 |
Posted By: CarlB
Date Posted: 13.Dec.2010 at 23:15
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Lisp is limited by the same precision as is AutoCAD. It can store 16 digits in a number. To properly display numbers as internally calculated, use the "rtos" function.
For your example, you'll see the accurate decimals by setting precision to 1 or higher:
(rtos (+ 100000.0 3.2) 2 1)
where the "2" specifies decimal output, "1" is the precision, which can be 0 to 16.
With large numbers, the number of decimal places may be less that the precision; such as:
Command: (rtos 1234567890.0987654321 2 16)
"1234567890.098765" |
Posted By: HAWDesigner
Date Posted: 13.Dec.2010 at 23:27
Nice!! Thanks Carl. I guess I learned my 'something new' today.  I have a limited knowledge of LISP, but I do have a background in computer programming and love getting tidbits of info like this. ------------- -- R. Williams AutoCAD 2010 Certified Professional <!-- If all else fails hit F1 --> <<AutoCAD 2009 |
Posted By: XPeter61
Date Posted: 14.Dec.2010 at 08:28
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CarlB,
thanks for your answer.
I think this is exactly the information I was looking for.
Peter
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