Determinant calculation of 6x6 matrix

Welcome Guest! To enable all features please Login. New Registrations are disabled.

Notification

Error

User Name or E-Mail Address:

Password:

Determinant calculation of 6x6 matrix

Options

Previous Topic Next Topic

agungsetyod		#1 Posted : 06 November 2014 10:24:32(UTC)
Rank: Newbie Groups: Registered Joined: 06/11/2014(UTC) Posts: 2		I calculate determinant of a 6x6 matrix with smath and Excel, but the results are different. Whats the problem? File Attachment(s): Question1.sm (4kb) downloaded 115 time(s).


User Profile View All Posts by User View Thanks


	Wanna join the discussion?! Login to your SMath Studio Forum forum account. New Registrations are disabled.

mikekaganski		#2 Posted : 06 November 2014 11:40:19(UTC)
Rank: Advanced Member Groups: Registered Joined: 17/01/2013(UTC) Posts: 296 Location: Khabarovsk, Russia Was thanked: 151 time(s) in 107 post(s)		SMath gives -5.6406E-7 MS Excel/LibreOffice gives -1.7486E-7 If you use some online solvers, they give you other different results: http://matrix.reshish.com gives -3.497202527569246e-7 http://www.bluebit.gr/matrix-calculator gives 0.000000437150316 ...and so on... Finally, WolframAlpha gives zero. It is floating-point error side-effect, so this result should not be considered "erroneous"; when doing floating-point math you always should be prepared to such things. See relevant Wikipedia article, and especially this brilliant series: http://randomascii.wordp...category/floating-point/ Edited by user 06 November 2014 11:42:32(UTC) \| Reason: Not specified
		Best regards, Mike Kaganski

3 users thanked mikekaganski for this useful post.		on 06/11/2014(UTC), on 06/11/2014(UTC), on 06/11/2014(UTC)
User Profile View All Posts by User View Thanks

mkraska		#3 Posted : 06 November 2014 12:44:55(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)		Maxima gives the exact answer. File Attachment(s): detmaxima.sm (7kb) downloaded 46 time(s). mkraska attached the following image(s):
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx

1 user thanked mkraska for this useful post.		on 06/11/2014(UTC)
User Profile View All Posts by User View Thanks

Users browsing this topic
Guest

Forum Jump

You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.