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rsunny		#1 Posted : 13 February 2011 16:20:45(UTC)
Rank: Newbie Groups: Registered Joined: 13/02/2011(UTC) Posts: 2 Location: Germany		Hello, I am new to sMath. During my first steps on playing around with matrices and summation of matrices I found the following bug: Open in SMath Cloud
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omorr		#2 Posted : 13 February 2011 19:36:28(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, I agree, it is a bit unusual. Perhaps it is the result of Andrey's efforts regarding the introduction of block (nested) matrices. I←mat(1,0,0,0,1,0,0,0,1,3,3)C←mat(0,0,1,3,1) sum((I*C),i,1,2)=mat(0,0,2,3,1) sum((I*mat(0,0,1,3,1)),i,1,2)=mat(0,0,mat(2,0,0,0,2,0,0,0,2,3,3),3,1) sum((mat(1,0,0,0,1,0,0,0,1,3,3)*C),i,1,2)=mat(mat(0,0,2,3,1),0,0,0,mat(0,0,2,3,1),0,0,0,mat(0,0,2,3,1),3,3) Regards, Radovan
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rsunny		#3 Posted : 13 February 2011 21:16:04(UTC)
Rank: Newbie Groups: Registered Joined: 13/02/2011(UTC) Posts: 2 Location: Germany		Hello Radovan, thank you for your quick reply! It sounds very interesting, these block (nested) matrices. How do I have to interpret the results? Open in SMath Cloud
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omorr		#4 Posted : 13 February 2011 22:35:17(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, In my opinion, this should be interpreted as a bug - as you mentioned in the first place. Until Andrey gives the final answer, we should be aware of this behavior that you've find out. Regards, Radovan
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omorr		#5 Posted : 15 February 2011 10:22:31(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		Hello, Here is more about block matrices: A←mat(1,0,0,0,1,0,0,0,1,3,3)B←mat(0,0,1,3,1) mat(A,A,A,A,2,2)*mat(B,B,2,1)=mat(mat(0,0,2,3,1),mat(0,0,2,3,1),2,1)mat(A,A,A,A,2,2)*mat(0,1,2,1)=mat(mat(1,0,0,0,1,0,0,0,1,3,3),mat(1,0,0,0,1,0,0,0,1,3,3),2,1) sum((mat(A,A,A,A,2,2)*mat(B,B,2,1)),i,1,2)=mat(mat(0,0,4,3,1),mat(0,0,4,3,1),2,1)sum((mat(A,A,A,A,2,2)*mat(0,1,2,1)),i,1,2)=mat(mat(2,0,0,0,2,0,0,0,2,3,3),mat(2,0,0,0,2,0,0,0,2,3,3),2,1) sum((A*mat(0,1,2,1)),i,1,2)=mat(0,mat(2,0,0,0,2,0,0,0,2,3,3),2,1) but this, of course, is not allowed: A*mat(0,1,2,1)=# I think that Andrey did not finish all the issues regarding block matrices yet. Regards, Radovan Edited by user 15 February 2011 10:29:00(UTC)  | Reason: Not specified
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