Problem with polar form of complex numbers

[nikos92]

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!!!

[Carlos295pz]

Use the +/- key to insert the negative sign

[salvomic]

(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 :-)

[Helge Gabert]

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?

[salvomic]

(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...

[nikos92]

(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

[webmasterpdx]

For polar/rect type work, read the article in the Prime wiki here...
http://www.wiki4hp.com/doku.php?id=prime:polrec

[salvomic]

(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!