About "RuntimeWarning: invalid value in power ..." warnings.

[onlyhope10]

xdata=np.array([10,20,30,60,120,180,360,720,1440])
ydata=np.array([243,194,171.9,128.1,76.7,54.7,31,16.2,8.4])

def func(xdata,a,b,n):
return a/(xdata+b)**n

init=np.array([1,1,1])

best_val,covar= curve_fit(func,xdata,ydata,p0=init)
print(best_val)

Warning (from warnings module):
File "G:\least_sq.py", line 12
return a/(xdata+b)**n
RuntimeWarning: invalid value encountered in power
[1.14275303e+04 4.08207279e+01 9.84057243e-01]

Please help me how do I fix my RuntimeWarning..thanks

[KelSolaar]

Hi @onlyhope10,

This code has nothing to do with Colour so I don't think this issue belongs here. That said what you are getting here is a warning that happened when Scipy tested values in the optimisation process and probably ended up raising a negative number to a fractional power or something along those lines.

[KelSolaar]

Closing this one, feel free to continue the discussion though!