 Rank: Newbie
Groups: Registered
Joined: 18/02/2010(UTC)
Posts: 1
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 When I updated to the newest version, I was unable to use the calc der feature now it just shows d/dx without solving it I'm doing the exact same thing as I did with the old version, typing the equation, then selecting x, go to calc, differentiate Am I doing something wrong -.-, or did it change in the new version? Tested it on my laptop, pc, and phone, all had the same problem 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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Do not understand, sorry What do you mean by "calc"? Choose the "Derivative" operator from the "Functions" pallete. In the version 0.87 just start typing "di" and you will have a list (Dynamic assistance feature). Choose "diff(2)" for derivative (with arrow down and CTRL+ENTER, SHIFT+ENTER or double click with the mouse), and you will get the same derivative template. Just fill the placeholders and pres CTRL+. for symbolic or = for numeric result. diff((2*x^2);x)—4*xx←5diff((2*x^2);x)=20EDIT: I understand now, sorry again. You just type 2*x^2Select the "x" and choose "Calculation->Differentiate". Then you will get the same like on your picture diff(2*x^2;x)The first derivation over "x" is not calculated?. It is the same in this and few previous versions I tried, except in the version 0.85_3531 - it is working well (the calculation is performed). Therefore, it might be a bug? On the other hand there might be some more bugs. This is from 0.85_3531. When I type 4*x^3+5*xAnd choose "Calculation->Differentiate", here is the result 5+4*x^2+8*x^2Then selecting this and choosing "Calculation->Simplify" will get this 5+12*x^2In spite of, diff((4*x^3+5*x);x)—5+12*x^2Regards, Radovan Edited by user 18 February 2010 14:37:23(UTC)
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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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Actually, I was informed about this issue couple of days before and I've fixed it already. Please, wait for next version of SMath Studio (maybe current month).
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Rank: Newbie
Groups: Registered
Joined: 24/08/2010(UTC)
Posts: 2
Location: California
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First, I really enjoy and appreciate SMath Studio. I used to use Mathcad, but I really like your program a lot. Thanks so much for making it and sharing it with everyone! Second, I wonder if perhaps I've run into the same bug? I defined a function as follows: f(q):= 75*q - 5/4*q^2. Then I asked for the derivative and the result the software gave me was: (4*(300 - 5*q) - 20*q) / 16. That's just plain wacky. Here's a screen capture to make it more clear: Differentiation Error?Does that seem as wrong to you as it does to me? Thanks in advance.
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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, That is due to the symbolic engine of SMath. I do not know what is "under the hood" but the result is correct: {4*(300-5*q)-20*q}/16which equals to: 4*300/16=75+ {4*(-5*q)-20*q}/16—-{5*q}/2that is 75-5/2*qSymbolic manipulation of expressions is not quite available. Regards, Radovan Edited by user 24 August 2010 18:40:43(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: 24/08/2010(UTC)
Posts: 2
Location: California
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Ah, nuts. At first I did expect it to be in simplest form, but apparently I made an error in the simplification. Thanks for the correction.
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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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Phileosophos wrote:Ah, nuts. At first I did expect it to be in simplest form, but apparently I made an error in the simplification. Thanks for the correction. You are welcome. As far as I know, SMath has its own symbolic engine (Andrey would explain that better). For some time there is Xcas functionality available on portable systems in the form of plugin. I hoped that the same would be for the desktop systems as well. I think this would improve symbolic engine of SMath quite a lot. I realy do not know what hapened with it. I even do not know if this is still actual or not. Regards, Radovan Edited by user 24 August 2010 20:23:49(UTC)
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When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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