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+--- Thread: Help for a "Surface and Flux integrals" program (/thread-9433.html)
RE: Help for a "Surface and Flux integrals" program - Arno K - 11-06-2017 08:44 PM
Another topic to be documented.
Arno
RE: Help for a "Surface and Flux integrals" program - Arno K - 11-06-2017 08:57 PM
(11-06-2017 06:49 PM)salvomic Wrote:I added to the posted program the two lines with purge(u) and purge(v) and made u and v local until the problem is solved.(11-06-2017 06:37 PM)Arno K Wrote: No no, now it works, but I am not that contented with implementing of local variables and then purging them to avoid their occurance in memory-manager.
Arno
I know, you are right, that's only a workaround, but the occurrence in memory manager leaves there variables that after some time could interfere with other commands or programs...
We need a real solution :-)
Salvo
RE: Help for a "Surface and Flux integrals" program - salvomic - 11-06-2017 09:13 PM
(11-06-2017 08:57 PM)Arno K Wrote: I added to the posted program the two lines with purge(u) and purge(v) and made u and v local until the problem is solved.
you have done well. When there will be a better solution we'll be able to avoid local u and v and also purge()...
I have done the same in my program for Linear and curvilinear integrals (in Library) for the same purpose.
RE: Help for a "Surface and Flux integrals" program - parisse - 11-07-2017 07:13 AM
There is no better solution! Declaring symbolic variables as local variables and purge them after (or assume(.,DOM_SYMBOLIC)) is the recommanded way to use symbolic variables in a CAS function.
RE: Help for a "Surface and Flux integrals" program - salvomic - 11-07-2017 08:32 AM
(11-07-2017 07:13 AM)parisse Wrote: There is no better solution! Declaring symbolic variables as local variables and purge them after (or assume(.,DOM_SYMBOLIC)) is the recommanded way to use symbolic variables in a CAS function.
well, thank you. I'm using this method and it's ok.
RE: Help for a "Surface and Flux integrals" program - Arno K - 12-02-2017 05:02 PM
Does not work anymore.
Arno
RE: Help for a "Surface and Flux integrals" program - salvomic - 12-02-2017 05:04 PM
(12-02-2017 05:02 PM)Arno K Wrote: Does not work anymore.sfint()?
Arno
and why? what is changed?
I'm trying the example you wrote:
Code:
The surface of a paraboloid is then calculated:
sfint(1,[u*cos(v),u*sin(v),u^2],[0,1],[0,2*π]) which yields 1/6*(√5*5*π-π)Salvo
RE: Help for a "Surface and Flux integrals" program - Arno K - 12-02-2017 05:23 PM
It puts out shit on VC, works on HW, I will try a reset of VC and reinstall everything, I simply wanted to try debug with cas.
Arno
I cleared memory and reinstalled a backup, then it worked again, so upgrading still needs a memory wipe, at least from time to time.
RE: Help for a "Surface and Flux integrals" program - salvomic - 12-02-2017 05:38 PM
understood. I tried on HW and it worked...
Maybe time to time a refresh of memory is needed, yes.