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+--- Thread: fsolve different in Home and CAS? (/thread-3905.html)
fsolve different in Home and CAS? - salvomic - 05-18-2015 08:21 PM
hi,
in a program of mine I'm trying this line
Code:
fsolve(ΣLIST(MAKELIST((flows(I)/X^(I-1)),I,1,SIZE(flows))),X)-1;Trying with this list
flows:={-79000, 14000, 11000, 10000, 10000, 10000, 9100, 9000, 4500, 100000}
In CAS I get [-1.01369... 0.137197...] (for the program I need only the second, but both are interesting to know)
in Home I get "Error: Bad argument type"
Are the Home/CAS settings relevant or there is a difference for fsolve in the two?
Or the error was generated by ΣLIST or MAKELIST or ...SIZE?
Salvo
RE: fsolve different in Home and CAS? - Helge Gabert - 05-18-2015 08:43 PM
Yes, fsolve is a CAS function. I just tried a simple numerical problem in Home, and fsolve doesn't work there. Not sure if nSolve did work in Home at one time - - but that function is gone with the newest update.
In Home, try FNROOT.
RE: fsolve different in Home and CAS? - salvomic - 05-18-2015 08:45 PM
(05-18-2015 08:43 PM)Helge Gabert Wrote: Yes, fsolve is a CAS function. I just tried a simple numerical problem in Home, and fsolve doesn't work there. Not sure if nSolve did work in Home at one time - - but that function is gone with the newest update.
In Home, try FNROOT
thank you Helge,
so now I think to mage the program for IRR in #CAS version, but then I must solve another question: why in a #CAS program EDITLIST doesn't seem to update a list?
RE: fsolve different in Home and CAS? - Helge Gabert - 05-18-2015 08:55 PM
Yes, in CAS, EDITLIST doesn't store the new value(s). Either store the individual entries, e.g., MYLIST(5):=22, or store the entire list again, once you exit EDITLIST, because the new values will be echoed to the screen (with STO ->).
RE: fsolve different in Home and CAS? - salvomic - 05-18-2015 08:58 PM
(05-18-2015 08:55 PM)Helge Gabert Wrote: Yes, in CAS, EDITLIST doesn't store the new value(s). Either store the individual entries, e.g., MYLIST(5):=22, or store the entire list again, once you exit EDITLIST, because the new values will be echoed to the screen (with STO ->).
so, in a #CAS program is EDITLIST useless?
There is no way to update a list (or a matrix) in such a program?
Salvo
RE: fsolve different in Home and CAS? - Helge Gabert - 05-18-2015 09:00 PM
Yes, I'd say don't use EDITLIST in a CAS program, just overwrite the new elements of the lists directly. That works!
RE: fsolve different in Home and CAS? - salvomic - 05-18-2015 09:02 PM
(05-18-2015 09:00 PM)Helge Gabert Wrote: Yes, I'd say don't use EDITLIST in a CAS program, just overwrite the new elements of the lists directly. That works!
ok!