Why solve() is not solving? - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: HP Prime ( /forum-5.html)+--- Thread: Why solve() is not solving? ( /thread-6514.html) |

Why solve() is not solving? - tiamattia - 07-07-2016 01:22 PM
Hello, I'm trying to solve a complex equation. This is the function i defined "gamma": [attachment=3722] If i write: [attachment=3723] The calculator says: [attachment=3724] As you can see in the second image, no result is returned. Why? Is there a way to solve this or i have to write it in explicit form? RE: Why solve() is not solving? - ww63 - 07-07-2016 02:34 PM
Maybe, because the Gamma function isn't a function, that can be described analytical. So you can only solve witha numreical algorithm? RE: Why solve() is not solving? - tiamattia - 07-07-2016 02:39 PM
I tried to use fsolve() with no success. Now i've re-wrote the function using 2*pi*f instead of omega and both solve and fsolve converge to a solution. RE: Why solve() is not solving? - Tim Wessman - 07-07-2016 04:19 PM
(07-07-2016 01:22 PM)tiamattia Wrote: I'm trying to solve a complex equation. This is the function i defined "gamma": Can you show how you defined it? It should work provided your definition is correct. RE: Why solve() is not solving? - tiamattia - 07-07-2016 05:11 PM
Hello Tim, I defined it with this cmd: [attachment=3725] RE: Why solve() is not solving? - Tim Wessman - 07-07-2016 08:31 PM
Did you just replace omega by 2*pi*f or make any other changes? Note, you can just copy/paste your text directly from the emulator if you are using that. Makes it easier rather then pictures everyone has to type and hope they didn't make a mistake. RE: Why solve() is not solving? - tiamattia - 07-07-2016 10:22 PM
Yes, this is what i'm executing: Code:
(I'm using the character sigma (lower case) σ, that is an alias of the character sigma (upper case) ∑ which is the summation function, as a variable. I don't think this is the problem beacuse i'm using it in both situations...) RE: Why solve() is not solving? - parisse - 07-08-2016 07:28 AM
There is an invalid char in your definition (charcode E003). This makes the equation a symbolic equation depending on this variable (i.e. gamma(x,1,1,1) depends on x and this variable), RE: Why solve() is not solving? - tiamattia - 07-08-2016 12:01 PM
That's i, the imaginary unit. It is defined it in the private user area of the calc charachter map. RE: Why solve() is not solving? - roadrunner - 07-08-2016 02:00 PM
Did you type purge(x) before the solve and fsolve commands? The reason I ask is when I can cut and pasted your equations into the emulator I obtained the expected results: {1.00000005156}. When I typed x:=3 first I got empty brackets: []. -road RE: Why solve() is not solving? - tiamattia - 07-08-2016 04:56 PM
I tried, still not solving RE: Why solve() is not solving? - parisse - 07-09-2016 07:58 AM
I checked with the emulator and got 1.0. RE: Why solve() is not solving? - roadrunner - 07-09-2016 12:48 PM
(07-08-2016 04:56 PM)tiamattia Wrote: I tried, still not solving Did you try doing a reset on the emulator? That may be what is needed. -road RE: Why solve() is not solving? - tiamattia - 07-09-2016 01:57 PM
No, i haven't tried yet. I will try as soos as I can. |