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Definite Integration of the Exponential Function
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Hi All, Maybe this issue has been resolved somewhere in the forum already I'm not aware of. I spotted a strange behavior of the definite integral of the exponential function raised up to any power larger than one whenever the "Maxima" plugin is installed. The problem will go away when MaximaTakeover "none" is set for SS version prior to "0.98_xxxx". Starting from "0.98_xxxx", I have to disable the "Maxima" plugin from the plugin manager in order to resolve the issue. Try to run the attached worksheet using both the most recent SS version and the portable version for comparison, then you may see my question more clearly.  sm-qn001.sm (54kb) downloaded 20 time(s).Any clue? Thanks in advance, Jason N.B.: I'm using Maxima 5.34.1 (on Windows 7 Home Premium). I tried the most recent version and still get the same observation. I have also tried a clean installation of SS. No problem without any plugin. Reproducible observation once the "Maxima" plugin is installed.
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Joined: 05/06/2014(UTC) Posts: 348  Location: Colombo Was thanked: 127 time(s) in 82 post(s)
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I too face the same problem in definite integrals in all my SS files under 98, with Maxima 5.34.1. These SS files ran fine under 97. Edited by user 04 April 2016 10:48:32(UTC)
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Look within!... The secret is inside you.
Best Regards
Eng. NDTM Amarasekera - Sri Lanka |
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Try integrate GID style [GID => Get It Done]. Works well. Quite a long epansion ! Does not plot otherwise than GID. Jean  Scrap Integrate GID.sm (18kb) downloaded 17 time(s).
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Read more in the attached. Your Int[exp(x^3)] is DEFINITIVELY wrong and DEFINITLY wrong ... Why ? Plot first ... so what ? So what: the inetegrator is kitchen style, totally incapable of integrating in the infinite limit. As it looks in the range 0..2 the result is X^huge ...X^zillions. Alternately it might be possible to use Legendre method. There may be an example in Samples. Still you will have to compose Legendre coefficients from the web. From recollection they are tabulated up to 50. A quick way is to tabulate exp(x^3) and use the FD [Finite Differences] integrator. The maple GAMMA may not have the Smath equivalent ... another puzzle . Cheers, Jean Scrap Integrate GID.sm (27kb) downloaded 15 time(s).
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Rank: Advanced Member Groups: Registered
Joined: 05/06/2014(UTC) Posts: 348 Location: Colombo Was thanked: 127 time(s) in 82 post(s)
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Originally Posted by: ndtma  I too face the same problem in definite integrals in all my SS files under 98, with Maxima 5.34.1.
These SS files ran fine under 97. Two images WITH and WITHOUT Maxima plugin 5.34.1 attached. SS file also attached Reservoir Flood Capacity Estimation-R1.sm (190kb) downloaded 19 time(s).  Edited by user 04 April 2016 21:12:40(UTC)
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Look within!... The secret is inside you.
Best Regards
Eng. NDTM Amarasekera - Sri Lanka |
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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Sorry Collab: can't open the file. 
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Windows XP does not take - [minus] as a separator
it takes (name) , does it take (1) not sure.
I much prefer using [square brackets].... [rev 0], [rev 1]
Just rename your file. If I can plot your F1(t), one way
or another, you will have your integral.
Just annoying it fails from one Smath version to another.
Jean
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Joined: 05/03/2009(UTC) Posts: 433  Location: USA Was thanked: 17 time(s) in 15 post(s)
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ndtma, You have other plugins that may not be playing nice ...  I had to update "Custom Functions" and download "Writer Region" Also, in lieu of the SS version ..., use the new built in "appversion(3)=" function  Looking at your sheet as I write this, but wanted to point out the other plugins. Confirmed Maxima crash ... Edited by user 04 April 2016 22:25:47(UTC)
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Rank: Advanced Member Groups: Registered
Joined: 05/06/2014(UTC) Posts: 348 Location: Colombo Was thanked: 127 time(s) in 82 post(s)
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The two plugins were already updated. Before writing to the forum, I tried a clean re-installation of SS 98.5935 with minimum required plugins installed and updated. But still the problem with Maxima plugin remains. By the way how do you use "appversion"? Edited by user 04 April 2016 22:29:11(UTC)
| Reason: Not specified |
Look within!... The secret is inside you.
Best Regards
Eng. NDTM Amarasekera - Sri Lanka |
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Rank: Advanced Member Groups: Registered
Joined: 05/03/2009(UTC) Posts: 433 Location: USA Was thanked: 17 time(s) in 15 post(s)
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Rank: Advanced Member Groups: Registered
Joined: 05/06/2014(UTC) Posts: 348 Location: Colombo Was thanked: 127 time(s) in 82 post(s)
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Look within!... The secret is inside you.
Best Regards
Eng. NDTM Amarasekera - Sri Lanka |
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