CAD tip # 12701:

Question CAD
% platform category

What is the maximum length of a list in AutoCAD VisualLISP?

AutoLISP and VisualLISP in AutoCAD is - as any LISP implementation - based on lists.

If you create long lists in your add-on application, e.g. lists of points, you may be afraid of a possible limit on list size.

VisualLISP (tested in AutoCAD 2021) has no fixed limit on list sizes. List length is limited only by the memory available for storing LISP lists.

The results may differ depending on the complexity of the list elements, but as a result of a practical test, the 64bit version of AutoCAD allows to create lists of simple elements (atoms) longer than 21 million items. Alas, around the level of 21.000.000, adding of more elements slows down substantially, probably the list storage memory gets virtualized. This can be confirmed by making the list elements more complex - if you store e.g. a sublist of 4 real numbers instead of a single number in such long list, the slowdown limit gets as low as about 4.500.000 elements.

You can download or testing LISP code here: maxlist.lsp (just drag it into your AutoCAD window).

ACAD

* CAD

18.8.2020 7280×

Comments Tell a friend

Prices - CAD eShop:

AutoCAD

applies to: AutoCAD ·

See also:
Tip 13653:	FPoly - draw fixed-length polylines in AutoCAD.
Tip 13221:	Attractor - snap multiple objects to existing points/vertices.
Tip 12105:	Select the smallest DWG object - MinOf utility.
Tip 11726:	Loading 3D models in the OBJ file format to AutoCAD.
Tip 11295:	Iterative Move, Scale and Rotate - till boundary touch.

Selected tip: Two types of equidistants (offsets) to an ellipse.

Back All CAD Tips

How to disable osnaps for xref objects? « | » Opposite angle for angular dimensions in Inventor drawings (iLogic).

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link:

CAD: OS: Categ:
Text:	FAQ glossary

Featuring:
Extend your AutoCAD LT productivity with our popular add-on
CADstudio LT Extension More info

Please use these tips at your own risk.
Arkance Systems is not responsible for possible problems that may occur as a result of using any of these tips.

	CAD Forum - tips, tricks, utilities, help, how-tos and FAQ for AutoCAD, LT, Inventor, Revit, Map, Civil 3D, Fusion 360, Forma, 3ds Max and other Autodesk software (support by Arkance Systems) - see About	Arkance Systems CZ s.r.o. (CAD Studio) - Autodesk Platinum Partner & Training Center & Consulting Services Partner	CONTACT: webmaster.cz@arkance-systems.com tel. +420 910 970 111
	Copyright © 2024 \| Advertise with us \| Online privacy

CZ \| EN \| DE
Login or
registration
	Visitors: 5924