09-27-2017, 03:04 PM
Post: #1
 DrD Senior Member Posts: 1,130 Joined: Feb 2014
Can displayed results with fractional powers be shown with an equivalent radical (√) sign, instead? Is there a toggle for this?

-Dale-
10-22-2017, 05:41 PM (This post was last modified: 10-22-2017 05:42 PM by salvomic.)
Post: #2
 salvomic Senior Member Posts: 1,366 Joined: Jan 2015
RE: convert fractional power to radical
(09-27-2017 03:04 PM)DrD Wrote:  Can displayed results with fractional powers be shown with an equivalent radical (√) sign, instead? Is there a toggle for this?

-Dale-

do you mean symbolic results?
I'm curious too how to obtain conversion, i.e., from 1/(x^3) into [3]√x or thing like that...
$$x^{\frac{1}{3}} \space \text{::} \sqrt[3]{x}$$

∫aL√0mic (IT9CLU), HP Prime 50g 41CX 71b 42s 12C 15C - DM42 WP34s :: Prime Soft. Lib
10-22-2017, 06:39 PM
Post: #3
 DrD Senior Member Posts: 1,130 Joined: Feb 2014
RE: convert fractional power to radical
Yes. I haven't found a way to do that.
10-22-2017, 10:00 PM
Post: #4
 webmasterpdx Senior Member Posts: 541 Joined: Sep 2015
RE: convert fractional power to radical
If it's in there it'd be in one of the algebraic expansion functions.
10-24-2017, 02:49 AM
Post: #5
 webmasterpdx Senior Member Posts: 541 Joined: Sep 2015
RE: convert fractional power to radical
There is a way to do this in a program. You'd have to write a function as follows...
Convert the expression to a string. Then, wherever NTHROOT shows up in the string, substitute for dd NTHROOT x with x^(1/dd). Likewise, to go the other direction, search for x^(1/dd) and convert to dd NTHROOT x, still in string format.
Then call EXPR on the result.
Enjoy. Publish this if you write it :-)
10-28-2017, 03:15 PM (This post was last modified: 10-28-2017 03:35 PM by salvomic.)
Post: #6
 salvomic Senior Member Posts: 1,366 Joined: Jan 2015
RE: convert fractional power to radical
I'd like to have something like QPI (see here), but more general (also for x and variables) and ...built in in the CAS. Maybe someday... who knows?

Salvo

EDIT: however, for now, i.e., in Home QPI(x^(½)) returns 0, in CAS it, after some time, returns "Error: insufficient memory"... and no result.

∫aL√0mic (IT9CLU), HP Prime 50g 41CX 71b 42s 12C 15C - DM42 WP34s :: Prime Soft. Lib
10-30-2017, 06:12 AM
Post: #7
 cyrille de brébisson Senior Member Posts: 1,007 Joined: Dec 2013
RE: convert fractional power to radical
Hello,

The problem is that this is a hard nut to crack and can yeild fairly long calculations.

Cyrille

Although I work for the HP calculator group, the views and opinions I post here are my own. I do not speak for HP.
10-30-2017, 07:53 AM (This post was last modified: 10-30-2017 08:22 AM by salvomic.)
Post: #8
 salvomic Senior Member Posts: 1,366 Joined: Jan 2015
RE: convert fractional power to radical
(10-30-2017 06:12 AM)cyrille de brébisson Wrote:  Hello,

The problem is that this is a hard nut to crack and can yeild fairly long calculations.

Cyrille

Certainly, Cyrille, we understand that, however having radicals result would be useful.

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