Problem with polar form of complex numbers
12-14-2017, 06:34 PM
Post: #1
 nikos92 Junior Member Posts: 2 Joined: Dec 2017
Problem with polar form of complex numbers
Hi this my first post here, so I am sorry if this isn't the right section to post my problem.
I have a HP Prime updated to latest SW version (12066) .
When I try to input a complex number in polar form with NEGATIVE angle (for example 20<-45 ...by the symbol < I mean the angle symbol located at multiply key "x" of hp prime when pressed same time with shift) I got back the error message: No significant digits in number. If the angle of the polar complex negative isn't negative there is no problem...also I can input without problem the complex number with negative angle when I am in CAS mode...but is there any way to overcome this problem out of CAS mode?

Thank's in advance for any help, have a nice day!!!
12-14-2017, 07:18 PM
Post: #2
 Carlos295pz Senior Member Posts: 365 Joined: Sep 2015
RE: Problem with polar form of complex numbers
Use the +/- key to insert the negative sign

Viga C | TD | FB
12-14-2017, 07:35 PM (This post was last modified: 12-14-2017 07:44 PM by salvomic.)
Post: #3
 salvomic Senior Member Posts: 1,394 Joined: Jan 2015
RE: Problem with polar form of complex numbers
(12-14-2017 07:18 PM)Carlos295pz Wrote:  Use the +/- key to insert the negative sign

yes, in fact... Don't use the minus sign.

In the last beta 3 (not in previous firmware):
input 20 ∢ -45 (in DEG mode, with ± sign, shift M)
you get 20 ∢ -45
now press again shift ∢
it returns 14.1421356237-14.1421356237i
then press [a b/c]
and you get 10√2-10√2i
it works :-)

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
12-14-2017, 09:51 PM (This post was last modified: 12-14-2017 09:53 PM by Helge Gabert.)
Post: #4
 Helge Gabert Senior Member Posts: 467 Joined: Dec 2013
RE: Problem with polar form of complex numbers
Correct for Home,

but start in CAS

20 ∢ -45 ( 45 with +- button) OK

now grab 20 ∢ -45 from the CAS history and press Home and Enter, and you get the error. Perhaps this is the problem the OP ran into? Notice how in CAS the +- (unary) minus gets converted into the regular minus?
12-14-2017, 09:55 PM
Post: #5
 salvomic Senior Member Posts: 1,394 Joined: Jan 2015
RE: Problem with polar form of complex numbers
(12-14-2017 09:51 PM)Helge Gabert Wrote:  Correct for Home,

but start in CAS

20 ∢ -45 ( 45 with +- button) OK

now grab 20 ∢ -45 from the CAS history and press Home and Enter, and you get the error. Perhaps this is the problem the OP ran into? Notice how in CAS the +- (unary) minus gets converted into the regular minus?

yes, right, the ± is converted in minus passing to Home (it should be corrected, it's a little bug, yes). As a workaround it is good to change the minus in ±, for now...

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
12-14-2017, 10:34 PM
Post: #6
 nikos92 Junior Member Posts: 2 Joined: Dec 2017
RE: Problem with polar form of complex numbers
(12-14-2017 07:18 PM)Carlos295pz Wrote:  Use the +/- key to insert the negative sign

It works like a charm!!!

Thank you very much
12-15-2017, 11:26 AM
Post: #7
 webmasterpdx Senior Member Posts: 541 Joined: Sep 2015
RE: Problem with polar form of complex numbers
For polar/rect type work, read the article in the Prime wiki here...
http://www.wiki4hp.com/doku.php?id=prime:polrec
12-15-2017, 12:05 PM
Post: #8
 salvomic Senior Member Posts: 1,394 Joined: Jan 2015
RE: Problem with polar form of complex numbers
(12-15-2017 11:26 AM)webmasterpdx Wrote:  For polar/rect type work, read the article in the Prime wiki here...
http://www.wiki4hp.com/doku.php?id=prime:polrec

Well, thank you!

∫aL√0mic (IT9CLU) :: HP Prime 50g 41CX 71b 42s 39s 35s 12C 15C - DM42, DM41X - WP34s Prime Soft. Lib
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