 Rank: Newbie
Groups: Registered
Joined: 21/04/2010(UTC)
Posts: 7
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Hello,
Small bug that can lead to calculation errors:
For example, you type 3^2=9. Then you remind that you missed factor 2 before the expression, so if you put 2* before the expression graphically you see 2*3^2, but result is 36.
Thanks.
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  Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740   Was thanked: 318 time(s) in 268 post(s)
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Hello, This was mentioned few times here. The problem is about invisible brackets. 2*3^2=182*3^2=36It depends on how did you get this. If you enclose with the editing lines 3^2 or only 3 (horizontal and left vertical editing lines |__ ) then you will get different results. One should be very careful about it. It is even possible to do something like this: (2*3)^2=36Then you can mark with the mouse: 2*3Cut it and paste instead of: (2*3)You will get then, we might say, a wrong result: 2*3^2=36 You can even get from this (by Cut/Paste): (2+3)*(4+5)=45On the screen you will see (brackets will be invisible): 2+3*4+5=45I am not sure if this is a bug or not. I think that user might be very careful about this and use brackets when needed. Regards, Radovan Edited by user 11 May 2010 00:53:09(UTC)
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When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Newbie
Groups: Registered
Joined: 21/04/2010(UTC)
Posts: 7
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Hello again,
I see the point, but since all beauty of this program is clear WYSIWYG interface, I think this is a bug.
User must be sure that if formula he wrote is graphically represented right, calculation is made according to this formula, and not according to invisible brackets.
Ofcourse user can get rid of all potential problems by using alot of brackets, but I think this is a wrong way.
Thanks,
Denis.
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Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Hello Denis,
I think Andrey is aware of this problem of "invisible brackets" and he will fix this as soon as he can.
Regards,
Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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 Rank: Advanced Member Groups: Registered
Joined: 30/08/2009(UTC)
Posts: 52
Location: Australia
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I agree with Denis. If it looks the same on the screen it should behave the same. No excuses, especially, in a GUI.
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 Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616  Was thanked: 1978 time(s) in 666 post(s)
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Agree, this is a bug. Will fix.
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Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)
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Speaking of GUI, here is one of the first mistake of my students. These two regions look almost the same:  Of course, there are overlapping regions:  I am used to this, but this might be sometimes hard to trace. Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)
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I have some thoughts about this thing too: it might be not a problem in case if SMath Studio will contain magic button like "layout assistance" or "layout auto arrange". Program can find all overlaps and can correct locations of the elements to prevent such types of errors. Also, this can be not a button, but an option. I mean that program (it's only an idea for now) can do this work in background on every user change. If this will be stable and predictable enough this option could be turned on by default. Edited by user 11 May 2010 18:26:14(UTC)
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Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)
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Multiple issues fixed with wrong graphical representation of math expressions. Fix will be available with a new version of SMath Studio. For now, you can test calculation using SMath Studio Live.
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 Rank: Member Groups: Registered
Joined: 29/04/2010(UTC) Posts: 15 Location: Italy Was thanked: 4 time(s) in 2 post(s)
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Andrey, I guess you fixed more bugs in two months than what Mathcad did in the last 4 years. Well done, 
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