TypeError: 'numpy.ndarray' object is not callable

[Olaf-Randel]

I encountered this error last week, which has stranded my progress.
I worry about it most likely being an environment or machine specific issue, and therefore not reproducible, because it is thrown due to a provided code block. I would therefore also like to show this image that shows what the result is on my own computer.
economics_notebook.zip

[janboone]

Indeed, I cannot replicate the error. When I run the code it works perfectly fine.

Are you running this on the university server?

You can actually simplify your code a bit (but I do not expect this to solve this issue):

def condition(x,p):
    return x >= p

def demand(p,valuations):
    number_of_agens = 0
    return sum(condition(i,p) for i in valuations)

Can be simplified to:

def demand(p,valuations):
    return np.sum(valuations>p)

stackoverflow suggests that the error is caused by calling the array as a function, but your current code does not do this. Perhaps it was there in a previous version?

Let me know what happens when you run the code on the university server.

Jan.

[Olaf-Randel]

I am using jupyterlab.uvt.nl
What can I do to make sure it's running on the university server?
EDIT: As it turns out, changing the definition for the demand function does actually resolve the error. It must have been using it in a way that didn't account for the other implementation.
I will now attempt to catch up in the assignment, although I won't expect to be there by tomorrow morning.

[janboone]

Good to hear that things are resolved.

Just to be sure, can you run the following code on jupyterlab:

number_of_agents = 1000
number_of_goods = 100

valuations = np.array(sorted(pm.Normal.dist(100,20).random(size=number_of_agents),reverse = True))

def condition(x,p):
    return x >= p

def demand(p,valuations):
    number_of_agens = 0
    return sum(condition(i,p) for i in valuations)

def excess_demand(p,valuations,number_of_goods):
    return demand(p,valuations)-number_of_goods

price = optimize.fsolve(lambda x: excess_demand(x,valuations,number_of_goods),120)
print("{0: .2f}".format(price[0]))

This does not give any errors when I run it.

And you are lucky: there is no lecture tomorrow! You have a week to catch up ;)

Jan.

[Olaf-Randel]

The code you posted also works fine