Trigonometric Functions, Degrees and cas
07-17-2015, 04:21 PM
Post: #1
 Arno K Senior Member Posts: 470 Joined: Mar 2015
Trigonometric Functions, Degrees and cas
Today I entered sin(22.5°) in cas-mode, angle-mode is radians, to check if it provides the intended solution, 1/2*sqrt(2-sqrt(2)). Instead it delivered: sin(22.5*°), using deg from convert didn't help either, sin(45/2) was not better. Clearly with sin(45*PI/360) it worked, so I think this is another bug in the Prime, interoperation between the cas and other parts of the OS is concerned.
Arno
07-17-2015, 06:47 PM (This post was last modified: 07-17-2015 06:51 PM by roadrunner.)
Post: #2
 roadrunner Senior Member Posts: 446 Joined: Jun 2015
RE: Trigonometric Functions, Degrees and cas
That's nothing, I tried converting 1_deg to radians and got the correct number, 0.0174 but instead of the expected _rad unit I got 1.74532925199e−2_譕诬Ѝ抹嘁疋（ၶᯨ�ᑵ事ꄐ뤄Ţ痿０౵ҍֈඤ

Don't believe me? Here's the screen shot:

Road
07-17-2015, 07:14 PM
Post: #3
 Marcel Member Posts: 177 Joined: Mar 2014
RE: Trigonometric Functions, Degrees and cas
Hi,
In CAS mode, this make my Prime reboot!
Marcel.
07-17-2015, 08:28 PM (This post was last modified: 07-17-2015 08:31 PM by parisse.)
Post: #4
 parisse Senior Member Posts: 1,313 Joined: Dec 2013
RE: Trigonometric Functions, Degrees and cas
I just tried convert(1_deg,_rad) and I get 1.74...e-2_rad. Make sure to type convert in lowercase.
If you want to use ° inside CAS, just do that
°:=pi/180
Or run sin(45/2*pi/180)
07-17-2015, 08:28 PM
Post: #5
 Arno K Senior Member Posts: 470 Joined: Mar 2015
RE: Trigonometric Functions, Degrees and cas
(07-17-2015 06:47 PM)roadrunner Wrote:  0.0174 but instead of the expected _rad unit I got 1.74532925199e−2_譕诬Ѝ抹嘁疋（ၶᯨ�ᑵ事ꄐ뤄Ţ痿０౵ҍֈඤ
Don't believe me? Here's the screen shot:
Road
at least the number is correct, sometimes I wish me a 50G with the speed, the form-factor and the display of the Prime. In other words: Everytime I do something I come to the point I find some new "difficulties" hidden in the Prime which my program on the mobile and on the pc don't have, but as the Prime was too expensive to be kept in the drawer..., and somehow I like it.
Arno
07-17-2015, 08:35 PM
Post: #6
 roadrunner Senior Member Posts: 446 Joined: Jun 2015
RE: Trigonometric Functions, Degrees and cas
Hi Marcel,

I think I figured it out.

Typing convert in lower case works in cas: convert(1_(deg),1_(rad))

Using the sto soft button works in cas: 1_(deg)▶_(rad) but don't type a number before _rad.

Using the built-in menu item shift/units/tools/CONVERT or typing CONVERT (upper case) in CAS doesn't work but does work in home and rpn.
07-17-2015, 08:39 PM
Post: #7
 roadrunner Senior Member Posts: 446 Joined: Jun 2015
RE: Trigonometric Functions, Degrees and cas
Hi Arno,

The prime is an awesome machine. Software bugs are to be expected. They'll work them out eventually.

Road
07-17-2015, 10:10 PM
Post: #8
 Marcel Member Posts: 177 Joined: Mar 2014
RE: Trigonometric Functions, Degrees and cas
Hi!
Sorry, I used the CONVERT (upper case) in CAS mode and not the convert (lower case) !

In fact, to be an expert with the Prime, we have to use it a lot!

I do a lot of programming (Astro Lab) for the past two months ... now I will return to the basic!

Marcel
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