Problem with function definition

#1 Опубликовано: 13.03.2010 16:27:18

captainblack

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Any ideas on what is going on here (it is to check a limit numerically for a question posted on mathhelpforum):

(the limit is exp(-1/3))

CB

#2 Опубликовано: 13.03.2010 16:40:30

captainblack

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Is it because the function definition is not respecting the order of evaluation implied by the brackets?

CB

#3 Опубликовано: 14.03.2010 02:17:03

Andrey Ivashov

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Hello.

This is known problem. The only way to beat it is to use workaround with round(...) function as shown on the screenshot below:

This will be fixed later.

P.S.: The same type of error reported here: x^y=error.

#4 Опубликовано: 14.03.2010 10:42:17

captainblack

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Wrote
Hello.

This is known problem. The only way to beat it is to use workaround with round(...) function as shown on the screenshot below:

This will be fixed later.

P.S.: The same type of error reported here: x^y=error.

Thanks. I think I prefer the other work around from the other thread:

since it forces the order of evaluation.

CB

#5 Опубликовано: 31.03.2010 23:26:44

Andrey Ivashov

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To fix this I've added new useful option for every Math region, calls "Optimize evaluation".

It is possible now to prevent optimization of the function/variable definitions by symbolic library. Turning off the optimization can cause reducing of the evaluation performance, but it can increase it in some cases too. Also this feature can help to solve some possible issues in the future. See pictures bellow for further explanation:

Figure 1: Document with evaluation error.

Figure 2: Switching off control's optimization.

Figure 3: Document without evaluation error.

Feature will be available with the next SMath Studio release.

Regards.

#6 Опубликовано: 01.04.2010 14:09:51

captainblack

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That looks great (it will solve at least one other problem I have been having)

Thanks

CB

#7 Опубликовано: 10.04.2010 18:01:14

Radovan Omorjan

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Hello Andrey,

I hope this might fit under this topic.

There is "Explicit" function in SMath present (symbolic result only). I found this by browsing Russian side of the Forum. Moreover, this function is not present neither in the function list nor in the Dynamic assistant list. I am just courious, what would be with it. Are you intending to drop it out maybe?

Regards,
Radovan

When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"

#8 Опубликовано: 10.04.2010 20:32:37

Andrey Ivashov

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There are several undocumented functions (see three of them on the screenshot). They are not documented because I know some major problems related to them and don't want them to be used in the real worksheets, because they can be excluded from future versions of SMath Studio.