[SS-2368] Unit behavior - units don't match issue - Reciprocal units don't match when reciprocated - Сообщения
#1 Опубликовано: 05.08.2016 20:19:36
Hi,
I have run into a problem with using units which are reciprocals - specifically Ohms and Siemens.
If I try to add a quantity with units Ohms to the reciprocal of a quantity with units Siemens, an error occurs: Units don't match.
Due to computer limitations where I am presently, I have only text entry.
Example:
Ra := 1 Ohm
Ga := 1 S
Rsum := Ra + 1/Ga = "units don't match"
But they do cancel:
Rprod := Ra * Ga = 1
Is there a work-around I'm missing somehow?
Thanks,
Fred
I have run into a problem with using units which are reciprocals - specifically Ohms and Siemens.
If I try to add a quantity with units Ohms to the reciprocal of a quantity with units Siemens, an error occurs: Units don't match.
Due to computer limitations where I am presently, I have only text entry.
Example:
Ra := 1 Ohm
Ga := 1 S
Rsum := Ra + 1/Ga = "units don't match"
But they do cancel:
Rprod := Ra * Ga = 1
Is there a work-around I'm missing somehow?
Thanks,
Fred
#2 Опубликовано: 06.08.2016 10:20:10
Hello Fred,
it is a bug; as workaround you can transit through a 3rd variable with symbolic optimization on his definition, then it is possible to evaluate numerically this variable in a separate region (see the cloud example)
![2016-08-06 15_21_29-SMath Studio Desktop - [OhmSiemens.sm_].png](/ru-RU/file/A5YsGv/2016-08-06-15_21_29-SMath-Studio-Desktop---_OhmSiemens_sm___png)
it is a bug; as workaround you can transit through a 3rd variable with symbolic optimization on his definition, then it is possible to evaluate numerically this variable in a separate region (see the cloud example)
If you like my plugins please consider to support the program buying a license; for personal contributions to me: paypal.me/dcprojects
#3 Опубликовано: 18.08.2016 05:45:41
Hi,
I was trying to implement a formula to calculate needed inductance on a flyback transformer and the program reports that units do not match. However splitting the formula in smaller pieces I was able to get the result out of it.
units dont match.sm
Thank you.
I was trying to implement a formula to calculate needed inductance on a flyback transformer and the program reports that units do not match. However splitting the formula in smaller pieces I was able to get the result out of it.
units dont match.sm
Thank you.
#4 Опубликовано: 18.08.2016 05:53:04
It is the same bug as the one shown in the first post, so I moved your post here.
The problem is related to the numeric evaluation, but there is a workaround:
- remove the RHS (the evaluation = and all after it)
- change optimization to symbolical
- show the result alone (Lp=#)
Bug reported as SS-2368
The problem is related to the numeric evaluation, but there is a workaround:
- remove the RHS (the evaluation = and all after it)
- change optimization to symbolical
- show the result alone (Lp=#)
Bug reported as SS-2368
If you like my plugins please consider to support the program buying a license; for personal contributions to me: paypal.me/dcprojects
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nierges 19.08.2016 05:10:00
#5 Опубликовано: 19.08.2016 05:11:59
It is the same bug as the one shown in the first post, so I moved your post here.
The problem is related to the numeric evaluation, but there is a workaround:
- remove the RHS (the evaluation = and all after it)
- change optimization to symbolical
- show the result alone (Lp=#)
Bug reported as SS-2368
Thank you Davide, seems to work following your advice.
Emil
#6 Опубликовано: 19.08.2016 12:07:49
Both issues fixed. See latest available nightly build: http://en.smath.info/forum/yaf_postst7698_SMath-Studio-0-98-6073--19-August-2016.aspx
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Davide Carpi 19.08.2016 20:35:00
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