CODEWITHSUNDEEP
pythonnumpyscipy
Mister Knister
Mister Knister

Reputation: 53

SciPy Derivative Function - Argument Parsing Failure

I am trying to find the derivative of a function with the scipy derivative module. Unfortunately I cant parse my argument into the function without a TypeError:

def f(x, *arg):
    beta = arg
    y = -x + beta * np.tanh(x)
    return y

param = (0,)
der_x0 = derivative(f, x0 = 0.0, dx = 1e-6, args = param)

Output:

TypeError: 'numpy.float64' object cannot be interpreted as an integer

Upvotes: 2

Views: 122

Answers (1)

Andre Holzner
Andre Holzner

Reputation: 18695

beta is of type tuple (try e.g. to add print(beta) after beta = arg and you should see something like (0,) as printout instead of 0).

Try:

beta = arg[0]

instead, i.e.

def f(x, *arg):
    beta = arg[0]
    y = -x + beta * np.tanh(x)
    return y

and you should get a value of -1.0 for der_x0.

Upvotes: 1

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