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+--- Thread: Problem with polar form of complex numbers (/thread-9699.html)
Problem with polar form of complex numbers - nikos92 - 12-14-2017 06:34 PM
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!!!
RE: Problem with polar form of complex numbers - Carlos295pz - 12-14-2017 07:18 PM
Use the +/- key to insert the negative sign
RE: Problem with polar form of complex numbers - salvomic - 12-14-2017 07:35 PM
(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 :-)
RE: Problem with polar form of complex numbers - Helge Gabert - 12-14-2017 09:51 PM
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?
RE: Problem with polar form of complex numbers - salvomic - 12-14-2017 09:55 PM
(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...
RE: Problem with polar form of complex numbers - nikos92 - 12-14-2017 10:34 PM
(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
RE: Problem with polar form of complex numbers - webmasterpdx - 12-15-2017 11:26 AM
For polar/rect type work, read the article in the Prime wiki here...
http://www.wiki4hp.com/doku.php?id=prime:polrec
RE: Problem with polar form of complex numbers - salvomic - 12-15-2017 12:05 PM
(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!