convert fractional power to radical

09272017, 03:04 PM
Post: #1




convert fractional power to radical
Can displayed results with fractional powers be shown with an equivalent radical (√) sign, instead? Is there a toggle for this?
Dale 

10222017, 05:41 PM
(This post was last modified: 10222017 05:42 PM by salvomic.)
Post: #2




RE: convert fractional power to radical
(09272017 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? 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√0 (salvomic, IT9CLU), HP Prime, 50g, 12C, 15C :: HP Prime Software Lib 

10222017, 06:39 PM
Post: #3




RE: convert fractional power to radical
Yes. I haven't found a way to do that.


10222017, 10:00 PM
Post: #4




RE: convert fractional power to radical
If it's in there it'd be in one of the algebraic expansion functions.


10242017, 02:49 AM
Post: #5




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 :) 

10282017, 03:15 PM
(This post was last modified: 10282017 03:35 PM by salvomic.)
Post: #6




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√0 (salvomic, IT9CLU), HP Prime, 50g, 12C, 15C :: HP Prime Software Lib 

10302017, 06:12 AM
Post: #7




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. 

10302017, 07:53 AM
(This post was last modified: 10302017 08:22 AM by salvomic.)
Post: #8




RE: convert fractional power to radical
(10302017 06:12 AM)cyrille de brébisson Wrote: Hello, Certainly, Cyrille, we understand that, however having radicals result would be useful. ∫aL√0 (salvomic, IT9CLU), HP Prime, 50g, 12C, 15C :: HP Prime Software Lib 

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