Question

I have created a simple function in python:

def func(a,x):
  return a+x*2

and then I call it

x = [log(1),log(2),log(4),log(5),log(8)]
#Import y data from a file
free= curve_fit(func,np.array(x),np.array(y))[0][0]
yline = func(free,x)

The resulting yline is twice as long as x and is has each element in there twice.

Why is that so?

Note:
I’m importing numpy but not scipy or curve_fit

Answer 1

x is a list and in func it will be “multiplied by two” (i.e. the number of its elements doubled).

If you want to multiply it by two (i.e. multiply each element), convert it to np.array first:

x = [log(1),log(2),log(4),log(5),log(8)]
#Import y data from a file
free= curve_fit(func,np.array(x),np.array(y))[0][0]
yline = func(free, np.array(x))