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[SS-2368] Unit behavior - units don't match issue
 Rank: Newbie
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Joined: 22/07/2013(UTC) Posts: 1  Location: Seattle, WA
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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 Edited by moderator 06 August 2016 16:26:53(UTC)
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  Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,690   Location: Italy Was thanked: 1368 time(s) in 895 post(s)
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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](/forum/resource.ashx?a=14431&b=2) Edited by user 06 August 2016 16:22:01(UTC)
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Rank: Newbie
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Joined: 04/05/2014(UTC) Posts: 3 
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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 (35kb) downloaded 37 time(s).Thank you.
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Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,690 Location: Italy Was thanked: 1368 time(s) in 895 post(s)
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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-2368Edited by user 19 August 2016 18:08:50(UTC)
| Reason: marked as FIXED |
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 1 user thanked Davide Carpi for this useful post.
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Rank: Newbie
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Joined: 04/05/2014(UTC) Posts: 3
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Originally Posted by: Davide Carpi  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
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  Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,617  Was thanked: 1981 time(s) in 667 post(s)
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1 user thanked Andrey Ivashov for this useful post.
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[SS-2368] Unit behavior - units don't match issue
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