Symbolic result for sum(#)

Symbolic result for sum(#) - Messaggi

#1 Pubblicato: 05/07/2020 19:17:35
Alvaro

Alvaro

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Hi. sum have an issue for symbolics evaluations.

Clipboard02.gif

Clipboard01.gif

Best regards.
Alvaro.
#2 Pubblicato: 05/07/2020 19:36:36
Jean Giraud

Jean Giraud

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Just check , Alvaro.
Between yourself and me ... we are old kookoo in those games !

VectorSum.PNG

#3 Pubblicato: 05/07/2020 20:51:36
overlord

overlord

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Wrote

Hi. sum have an issue for symbolics evaluations.

Best regards.
Alvaro.


You are correct, bug reproduced.
Definitely there are some issues.
Perhaps it is not only sum related too.

symbolic.png
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Alvaro 06/07/2020 03:46:00
#4 Pubblicato: 06/07/2020 03:45:56
Alvaro

Alvaro

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Hi. Thanks Overlord. I don't see these other problem. What make troubles for me is the fact that sum don't returns the symbolic values but numerical approximations, in this case for sqrt(17). I expect to see sum(vec) = 5/sqrt(17) instead the rational showed. I introduce the "x" value just for check if sum have some eval() function somewhere. But then ... ups, another issue simplifying 1+4.

Best regards.
Alvaro.
#5 Pubblicato: 06/07/2020 04:00:32
Martin Kraska

Martin Kraska

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sum.png
sum.sm (11,67 KiB) scaricato 1523 volta(e).
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
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Alvaro 06/07/2020 12:49:00
#6 Pubblicato: 06/07/2020 07:17:28
Jean Giraud

Jean Giraud

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I see no bug ...

NOBUG.sm (30,88 KiB) scaricato 1453 volta(e).
#7 Pubblicato: 06/07/2020 12:48:31
Alvaro

Alvaro

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Hi. Some notes attached.

sum.sm (20,39 KiB) scaricato 1462 volta(e).
sum.pdf (66,13 KiB) scaricato 818 volta(e).

Best regards.
Alvaro.
#8 Pubblicato: 07/07/2020 07:34:39
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

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Vsum.PNG
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