Problem with integral

Problem with integral - Сообщения

#1 Опубликовано: 01.04.2019 13:53:58
dzon_doe

dzon_doe

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Hi,

I have a problem with the integral. Please find the exemplary attached to this post. I have defined several variables and their units. In my opinion, everything is OK but SMath does not solve it when the temperature is defined as a vector T, or solve only the first integral if temperatures are defined separately (as T.1 and T.2). Can you explain to me why SMath cannot solve this integral?

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Best regards,
dzon_doe
#2 Опубликовано: 01.04.2019 15:32:36
Jean Giraud

Jean Giraud

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Wrote

Can you explain to me why SMath cannot solve this integral?


Sure it integrates an integrand and more.

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#3 Опубликовано: 01.04.2019 16:02:09
dzon_doe

dzon_doe

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Wrote


Sure it integrates an integrand and more.



To be honest, your explanation is not clear for me but I noticed that you removed all units. And in my sheet, it also works. Does the units the source of the problem?


Best regards,
dzon_doe
#4 Опубликовано: 01.04.2019 17:22:29
Jean Giraud

Jean Giraud

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Wrote

To be honest, your explanation is not clear for me but I noticed that you removed all units. And in my sheet, it also works. Does the units the source of the problem?



You first wrote:
Can you explain to me why SMath cannot solve this integral ?
Now you reply: And in my sheet it also works.
Maths are unitless, so I reject carrying units,
there are very many instances not supporting units.
Units were discussed ad nauseum in Mathsoft forum,
in > 125000 exchanges: not a single work sheet in units.

Cheers ... Jean
#5 Опубликовано: 01.04.2019 18:31:52
Alvaro Diaz Falconi

Alvaro Diaz Falconi

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Hi. Try this:

Clipboard01.gif

Best regards.
Alvaro
#6 Опубликовано: 01.04.2019 20:22:41
Martin Kraska

Martin Kraska

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Maxima can handle integrals with units. Yet the restriction applies that the integration variable must be undefined.

int_issue_Kr_units.sm (10 КиБ) скачан 47 раз(а).
int_issue_Kr_units.png
Martin Kraska Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
#7 Опубликовано: 01.04.2019 22:49:00
Jean Giraud

Jean Giraud

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Wrote

Maxima can handle integrals with units. Yet the restriction applies that the integration variable must be undefined


Native Smath does it in much greater elegance.

int_issue [Transit Method].sm (9 КиБ) скачан 39 раз(а).

Int-Transit.PNG
#8 Опубликовано: 02.04.2019 09:14:40
Jean Giraud

Jean Giraud

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Refreshed version managed from annoying units

Jmol.PNG

Integral 0000000 Transit-Units.sm (23 КиБ) скачан 32 раз(а).
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