Error of a function with Summation - The output of a function with summation has error Options  Email this topic  Watch this topic  Print this topic » Normal Threaded

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Novice		#1 Posted : 17 May 2016 21:15:15(UTC)
Rank: Member Groups: Registered Joined: 15/05/2016(UTC) Posts: 22 Location: Daejeon Was thanked: 1 time(s) in 1 post(s)		Hi! I'm a novice for SMath. I'm porting a Mathcad 15 file to SMath. I found that the SMath function with Summation has some error. There are difference between the output of direct calculation and function output.(See attached pictures) Please, check it and help me. Best regards, Novice question01.sm (8kb) downloaded 25 time(s).
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Ernesto		#2 Posted : 17 May 2016 22:34:32(UTC)
Rank: Advanced Member Groups: Registered Joined: 03/02/2014(UTC) Posts: 67 Was thanked: 13 time(s) in 11 post(s)		Looks like a bug. If you right click DD(0), and change the optimization to symbolic, it gives the right answer.
1 user thanked Ernesto for this useful post.		on 18/05/2016(UTC)
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Jean Giraud		#3 Posted : 18 May 2016 05:45:38(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Define as a function of an argument and use eval(,)
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Novice		#4 Posted : 18 May 2016 07:32:05(UTC)
Rank: Member Groups: Registered Joined: 15/05/2016(UTC) Posts: 22 Location: Daejeon Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Ernesto Looks like a bug. If you right click DD(0), and change the optimization to symbolic, it gives the right answer. Thank you! Whenever I got'the error message, "Result is above max. allowed positive number", I'll try to change the option.
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Novice		#5 Posted : 18 May 2016 07:52:56(UTC)
Rank: Member Groups: Registered Joined: 15/05/2016(UTC) Posts: 22 Location: Daejeon Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Jean Giraud Define as a function of an argument and use eval(,) Thank you Jean, it is great hint for me. I've tried to use 'eval' function for the output of summation function as like you. But I got another results.(See attached sample file) Would you mind check and help me? question01_b.sm (11kb) downloaded 19 time(s). Edited by user 18 May 2016 08:50:05(UTC)  | Reason: Not specified
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Jean Giraud		#6 Posted : 18 May 2016 17:56:47(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		You forgot to index λ
1 user thanked Jean Giraud for this useful post.		on 19/05/2016(UTC)
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Novice		#7 Posted : 19 May 2016 00:58:15(UTC)
Rank: Member Groups: Registered Joined: 15/05/2016(UTC) Posts: 22 Location: Daejeon Was thanked: 1 time(s) in 1 post(s)		Originally Posted by: Jean Giraud You forgot to index λ Dear Jean, Thank you very much for kind correction! Your timely comments enlightened me in the darkness!!
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