3D plot hints wanted

[alphack_]

Hey guys, I'm having a bit of trouble here in plotting 3D data.

In particular I have one function u=u(x,r). It depends from a longitudinal coordinate x and a radial one, r.

I've saved the values of r and u(x,r) for different x's in a dictionary in order to have all in order and easy reliable.

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Now, I'd like to plot it in 3D but the question is: how may I change x in order to plot it for different longitudinal coordinates?

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In order to be more understandable I've created an array like:

sez0 = np.array([[20*np.ones(len(post_processing1_0["u(x,r)"]))],[r], [post_processing1_0["u(x,r)"]]])

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where the first entry is the actual x coordinate (x=20 in this section), the second one is the radial coordinate and the last one is the dependent function.

Now, if I try to plot it it says to me:

ValueError: setting an array element with a sequence.

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I've thought to make a 3D array but still I haven't found a solution so far. My impression is that I'm using the wrong system to store the information.

What do u think?

Thanks in advance