No you are right, I have to write it in this way: MYMAPS = np.zeros([npha, nobs, nex, last-first+1], dtype=float) thanks Gabriele 2014-04-30 11:13 GMT-04:00 Robert Kern <robert.kern@gmail.com>:

On Wed, Apr 30, 2014 at 4:10 PM, Gabriele Brambilla <gb.gabrielebrambilla@gmail.com> wrote:

...

Hi,

I have a 4d numpy array.

I want to select an "index" of the fourth dimension to obtain a 3d array.

I try to di it in this way:

MYMAP = MYMAPS[:, :, :, 1]

that is defined in this way: MYMAPS = [np.zeros([npha, nobs, nex, last-first+1], dtype=float)]

but I receive an error: TypeError: list indices must be integers, not tuple

what am I doing wrong?

You have made MYMAPS a list with an array inside it. Did you mean to do this, instead?

MYMAPS = np.zeros([npha, nobs, nex, last-first+1], dtype=float)

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