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+--- 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.
https://en.wikipedia.org/wiki/Atan2
-Dale-
+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.
https://en.wikipedia.org/wiki/Atan2
-Dale-
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,
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
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).
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... :?