The pow function raise error with non integer exponent. how could I compute something like pow(x,0.3)

It seems to work fine for me. Can you provide an example?

mosari
The pow function raise error with non integer exponent. how could I compute something like pow(x,0.3)

>>> import math
>>> math.pow(3, .3)
1.3903891703159093
>>> math.pow(-3, .3)
Traceback (most recent call last):
File “<stdin>”, line 1, in <module>
ValueError: math domain error

When you have a rational exponent (i.e. a non integer), the expression is equivalent to… well, let's see how my ASCII art is:

(m/n) n —–
a = \ / (m)
\/ a


That is, the nth root of (pow(a, m)).

Since radicals are ill defined when the base is negative, you end up
with imaginary results. Which might prove difficult.

For example: pow(-5, 0.5) == sqrt(-5)

I assume this is your problem?

Yes this was the problem. thank you for your replies