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 olik #2 Posted : 18 May 2012 22:50:36(UTC) Rank: MemberGroups: Registered Joined: 08/03/2012(UTC)Posts: 25Location: Prague, Dolní ChabryWas thanked: 3 time(s) in 2 post(s) Hurrah, the function x>xi works correctly!Sposibo AndreyDo svidanija (regards) Olik 1 user thanked olik for this useful post. on 19/05/2012(UTC)
 Jarrinator #3 Posted : 19 May 2012 03:30:42(UTC) Rank: MemberGroups: Registered Joined: 15/05/2012(UTC)Posts: 14Location: Profeta Miqueas Oe10-309 y TabiazoWas thanked: 7 time(s) in 4 post(s) Trying to use the pi product from the right-hand side palette gives me "product(" and not the pi product notation. Is this a bug?Also the sigma sum in the same palette gives me a sum(1), and not the sum(4) with the sigma notation. I´ve already read that:>Function sum(1) now built-in to the program;I think that sum(4) is more important than sum(1), in the right-hand side palette.Edited by user 19 May 2012 04:03:17(UTC)  | Reason: Not specified Ecuadorian Electronic engineer and MBA student at Salesian Polytechnic University.
 omorr #4 Posted : 19 May 2012 08:41:51(UTC) Rank: AdministrationGroups: Registered, Advanced MemberJoined: 23/06/2009(UTC)Posts: 1,740Was thanked: 318 time(s) in 268 post(s) Hello,Originally Posted by: Jarrinator Trying to use the pi product from the right-hand side palette gives me "product(" and not the pi product notation. Is this a bug?It seems that it is a bug, unfortunately.Originally Posted by: Jarrinator Also the sigma sum in the same palette gives me a sum(1), and not the sum(4) with the sigma notation. I´ve already read that:>Function sum(1) now built-in to the program;I think that sum(4) is more important than sum(1), in the right-hand side palette.I suggested to Andrey the introducing of sum(1) operator for its frequent use. I agree that now might be a bit confusing to choose the sum(4) from the function list, or to type sum( or choose summation from the palette and then to type four arguments. On the other hand there might be another confusing side effect when making sum(4) from sum(1). The summation could be made without brackets. Look at this simple example:x:mat(1,2,3,3,1)sum((el(x,i)+7),i,1,3)=27Contrary to the:sum(el(x,i)+7,i,1,3)=27This was made from sum( and putting four arguments:sum(el(x,i),i,1,3)+7=13This is made by choosing sum(4) and then adding 7The sum(1) operator is useful and I am grateful to Andrey for introducing it, but unfortunately it seems some new side effects appeared with it.Regards,Radovan When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
 Andrey Ivashov #5 Posted : 19 May 2012 10:52:48(UTC) Rank: AdministrationGroups: Developers, Registered, Knovel Developers, Administrators, Advanced MemberJoined: 11/07/2008(UTC)Posts: 1,616Was thanked: 1978 time(s) in 666 post(s) Originally Posted by: Jarrinator Trying to use the pi product from the right-hand side palette gives me "product(" and not the pi product notation. Is this a bug?Yes, will be fixed soon.Originally Posted by: Jarrinator I think that sum(4) is more important than sum(1), in the right-hand side palette.Agree with you. Will correct this as well.Regards.
 Jarrinator #6 Posted : 21 May 2012 04:12:44(UTC) Rank: MemberGroups: Registered Joined: 15/05/2012(UTC)Posts: 14Location: Profeta Miqueas Oe10-309 y TabiazoWas thanked: 7 time(s) in 4 post(s) Originally Posted by: omorr Look at this simple example:x:mat(1,2,3,3,1)sum((el(x,i)+7),i,1,3)=27Contrary to the:sum(el(x,i)+7,i,1,3)=27This was made from sum( and putting four arguments:sum(el(x,i),i,1,3)+7=13This is made by choosing sum(4) and then adding 7The sum(1) operator is useful and I am grateful to Andrey for introducing it, but unfortunately it seems some new side effects appeared with it. Thanks for the explanation; about brackets, maybe they use some graphic space in the formulas, but they help us to avoid confusions when doing math operations with different expressions.Brackets are for math what units are for science and engineering. Ecuadorian Electronic engineer and MBA student at Salesian Polytechnic University.
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