Error in NumPy: 'numpy.ndarray' object is not callable

Question

I was working on a cournot problem, but was getting this error:

TypeError: 'numpy.ndarray' object is not callable

Can anyone help me locate the error I am getting?

'---> 16 c1= broyden1(resid(c,p_node,alpha,eta,phi), c) 17 phi1= np.polynomial.chebyshev.chebval(p_node,c1) 18 q1= phi1*c1 \scipy\optimize\nonlin.py in nonlin_solve(F, x0, jacobian,..) 274 275 dx = np.inf --> 276 Fx = func(x) 277 Fx_norm = norm(Fx) C:\Users\Gagan\Anaconda3\lib\site-packages\scipy\optimize\nonlin.py in <lambda>(z) 270 271 x0 = _as_inexact(x0) --> 272 func = lambda z: _as_inexact(F(_array_like(z, x0))).flatten() 273 x = x0.flatten() 274 TypeError: 'numpy.ndarray' object is not callable' — Elina Gilbert
– Elina Gilbert, Commented Apr 29, 2017 at 14:13
@ElinaGilbert formating tip: 4 spaces for code, 8 spaces for indented code. — Imanol Luengo
– Imanol Luengo, Commented Apr 29, 2017 at 14:26
What arguments does broyden1 take? Function? Initial value, args tuple? — hpaulj
– hpaulj, Commented Apr 29, 2017 at 15:01
@hpaulj 'broyden1' takes function and an initial guess value and returns the root finding solution. Here my initial guess is c=chebfit... — Elina Gilbert
– Elina Gilbert, Commented Apr 29, 2017 at 15:33

sascha · Accepted Answer · 2017-04-29 13:23:49Z

1

Your function resid returns an numpy-array at call-time.

Your need to give broyden a function, but gave it a called function, so it's not a function anymore, but was already evaluated to some array. This results in broyden1 to call the resulting numpy-array.

This is not equal:

c1= broyden1(resid(c,p_node,alpha,eta,phi), c)
c1= broyden1(resid, c)

I'm ignoring possible consequences here.

answered Apr 29, 2017 at 13:23

sascha

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Elina Gilbert Over a year ago

can you please suggest an alternative code to solve the same problem. Actually my motive is to find a coefficient c which makes mr-mc=0. Also, I have already tried c1= broyden1(resid, c) but it gives non convergent solution with error

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