Problem with polar_coordinates() - 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: Problem with polar_coordinates() ( /thread-10314.html) |

Problem with polar_coordinates() - Lamas - 03-12-2018 06:02 PM
Bonjour, Windows 10 Pro Rev : 1709 HP Prime virtual calculator Build 2018 1 24 Rev : 13333 iPhone IOS V : 11.2.6 IOS HP Prime V : 1.4.1.13513 Problem with polar_coordinates() (in degree mode) Functions Library extract … ------------------ // Conversion R-P EXPORT rp(X,Y) BEGIN M0:=polar_coordinates(X,Y); MSGBOX(X) ; MSGBOX(Y) ; MSGBOX(M0) ; RETURN(M0) ; END ; ------------ This function works on iPhone with keyboard input (X, Y and M0 msgboxes are OK). This function does not work in program mode with iPhone, (M0 stay [0,0] with msgbox). The same program work exhaustively with HP Prime virtual calculator on my desktop without any problem. Is there a bug on the new IOS HP Prime or there is a problem with my function. (With old IOS HP Prime version, funtion worked correctly). I have uninstalled and installed IOS HP Prime, switched off an on IOS device several times without change. Thanks a lot for your attention RE: Problem with polar_coordinates() - Tim Wessman - 03-12-2018 06:24 PM
I'm not seeing this on a version I just built and am running in the iOS simulator. I don't have any hardware handy to check on. I tried running the function directly from the HOME screen rp(10,10) [ENTER] for example. I then see a 10 box, 10 box and then [14.14..., .0785...] in a box. The vector is returned. Is that what I should be testing? Anyone else see this issue? RE: Problem with polar_coordinates() - Lamas - 03-12-2018 09:58 PM
Bonsoir, I found an elegant solution from Michael de Estrada : // Conversion P-R EXPORT pr(X,Y) BEGIN RETURN[X*COS(Y),X*SIN(Y)]; //RETURN(X*COS(Y),X*SIN(Y)); END; // Conversion R-P EXPORT rp(X,Y) BEGIN RETURN[ABS((X,Y)),ARG((X,Y)) MOD 360]; //RETURN(ABS((X,Y)),ARG((X,Y)) MOD 360); END; Thanks a lot for your attention. RE: Problem with polar_coordinates() - cyrille de brébisson - 03-13-2018 09:41 AM
Hello, I do not think that the mod 360 is a good idea. First, ARG should only return values from 0 to 360. Furthemore, this code is assuming degree mode (which is not a given). I would therefore suggest removing it. Cyrille RE: Problem with polar_coordinates() - Lamas - 03-13-2018 09:54 AM
Bonjour, Ok, If ARG() returns the correct value (for me), I agree with you to remove "MOD 360" but it does not. Thank you for your comment. RE: Problem with polar_coordinates() - Joe Horn - 03-13-2018 08:38 PM
(03-13-2018 09:41 AM)cyrille de brébisson Wrote: ARG should only return values from 0 to 360. (03-13-2018 09:54 AM)Lamas Wrote: Ok, If ARG() returns the correct value (for me), I agree with you to remove "MOD 360" but it does not. Lamas is right. They are different. In degree mode, ARG returns angles in the interval (-180,180], whereas MOD 360 returns values in the interval [0,360). RE: Problem with polar_coordinates() - YEDERF - 03-14-2018 06:02 PM
aquí un vídeo del tema que tratas de solucionar RE: Problem with polar_coordinates() - compsystems - 03-14-2018 07:33 PM
On Home Mode fail phasor1 := ( √(2) ∡ 3*(π/4) ); "Syntax Error" More info http://www.hpmuseum.org/forum/thread-7988-post-70023.html RE: Problem with polar_coordinates() - cyrille de brébisson - 03-15-2018 06:47 AM
Hello, I did not realize that the result was in the -180, 180 range. Then, maybe the mod should be with 2*acos(-1)) Cyrille RE: Problem with polar_coordinates() - DrD - 03-16-2018 02:04 PM
A couple of years ago I requested that atan2 be put on a list for future release enhancements. This would be useful for programs that need the inverse tangent mapped to the interval [0,2*pi). Polar coordinates, and navigation software are typical examples. It's easy to create a stand-alone program for this, but with all the other tools in the toolbox, atan2 seems like it would be a useful addition. https://en.wikipedia.org/wiki/Atan2 -Dale- RE: Problem with polar_coordinates() - chromos - 03-16-2018 04:45 PM
(03-16-2018 02:04 PM)DrD Wrote: A couple of years ago I requested that atan2 be put on a list for future release enhancements. This would be useful for programs that need the inverse tangent mapped to the interval [0,2*pi). Polar coordinates, and navigation software are typical examples. It's easy to create a stand-alone program for this, but with all the other tools in the toolbox, atan2 seems like it would be a useful addition. +1 RE: Problem with polar_coordinates() - John Keith - 03-16-2018 07:43 PM
(03-16-2018 02:04 PM)DrD Wrote: A couple of years ago I requested that atan2 be put on a list for future release enhancements. This would be useful for programs that need the inverse tangent mapped to the interval [0,2*pi). Polar coordinates, and navigation software are typical examples. It's easy to create a stand-alone program for this, but with all the other tools in the toolbox, atan2 seems like it would be a useful addition. Note that the linked article has an RPL equivalent, but it is incorrect. It should be \<< R\->C ARG \>> RE: Problem with polar_coordinates() - toml_12953 - 04-02-2018 05:49 AM
(03-12-2018 06:02 PM)Lamas Wrote: Bonjour, I ran the same program on iOS 11.3 with Prime Pro app 1.4.1.13513 and it works fine. Maybe the newer version of iOS fixed the problem. RE: Problem with polar_coordinates() - Lamas - 04-03-2018 07:04 AM
Bonjour, I just checked with the last firmwares update and I found, like you, that the problem disappeared. It is OK now. Thanks a lot for your reply. RE: Problem with polar_coordinates() - Tim Wessman - 04-03-2018 07:31 PM
Well that is kind of bizarre... :? |