Double indexing in a for loop

Question

I am trying to loop through a 2D array of coordinates and apply a function to them, but I am having trouble indexing both the x and y positions properly. Here is my code:

for i,j in range(330):
    aperture = phot.aperture.CircularAperture((xy[i,j]),3)
    photometry = phot.aperture_photometry(xy, aperture)

the xy array has a size of (330,2), and I want the function to be applied to each set of coordinates, but instead I receive the error cannot unpack non-iterable int object. How can I solve this?

for i,j in range(330) this is incorrect. You will get only one value each time. — Joe Ferndz
– Joe Ferndz, Commented Nov 2, 2021 at 16:31
@UlisesBussi I want the i index to refer to the x coordinate and the j index to be the y coordinate — Jimbles
– Jimbles, Commented Nov 2, 2021 at 16:40

Jan Krejci · Accepted Answer · 2021-11-02 16:39:29Z

3

to address each element of xy array, you need to do something like this

for i in range(330):
    for j in range(2):
        aperture = phot.aperture.CircularAperture((xy[i,j]),3)
        photometry = phot.aperture_photometry(xy, aperture)

answered Nov 2, 2021 at 16:39

Jan Krejci

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