Page 1 of 1
x^y, where x<0 and y non-integer
Posted: Wed Nov 29, 2017 4:24 pm
by Loreno
this seems silly, but i cant get it done:
i want to simply calculate
x^y, but neighter the **operator nor the power() function is working, because x<0 and y is non-integer.
example:
(-0.1)^(1/5)
how can i do this in gams?
Re: x^y, where x<0 and y non-integer
Posted: Wed Nov 29, 2017 6:58 pm
by Fred
Loreno,
What you try to do is mathematically not defined.
Fred
Re: x^y, where x<0 and y non-integer
Posted: Thu Nov 30, 2017 11:11 am
by Loreno
oh, i guess its been to long, that i have been to math class:) the reason i thought that it works, is that google actually gave me a result.
solution: (yes mathematicly not the same, but what i logicly wanted to do anyways)
-(abs(x)**y)
Re: x^y, where x<0 and y non-integer
Posted: Fri Dec 01, 2017 7:50 am
by Fred
Hi Loreno,
The signPower function may be what you are looking for:
https://www.gams.com/latest/docs/UG_Par ... =signpower
I hope this helps!
Best,
Fred