append python list with only the integer

Question

I have the code below, which works, but I want a list of integers only. How do I get python to only append the integer, and not the (array) portion?

import numpy as np
import matplotlib.pyplot as p

icp4 = np.loadtxt(icp4_img)
ptm = np.loadtxt(ptm_img)

inside, outside = [], []

with np.nditer(icp4, op_flags=['readwrite']) as icp_it, np.nditer(ptm, op_flags=['readonly']) as ptm_it:
    for icp, ptm in zip(icp_it, ptm_it):
        if icp[...] > 800:
            icp[...] = 1
        else:
            icp[...] = 0
        if np.all(icp > 0):
            inside.append(ptm)
        else:
            outside.append(ptm)

p.imshow(icp4, interpolation='nearest', cmap='gray')
p.show()
print(insdie)
>>>[array(435.), array(945.), array(761.)]

adding the if ptm.shape == () does not change the output

Sarah
– Sarah

2022-05-02 14:00:12 +00:00
Commented May 2, 2022 at 14:00 — Sarah
– Sarah, Commented May 2, 2022 at 14:00

OTheDev · Accepted Answer · 2022-05-02 14:21:36Z

1

It appears that each ptm is a scalar array.

To obtain the scalar equivalent of a scalar array ptm, use ptm.item() (documentation).

So instead of appending ptm to inside, try appending ptm.item().

Alternatively, appending float(ptm) should accomplish the same task. If this needs to be an integer, append int(ptm) instead.

Remark

To obtain the scalar equivalent of a scalar array, one used to be able to use numpy.asscalar(). However, that function is now deprecated. The documentation says to use the item() method instead.

edited May 2, 2022 at 14:21

answered May 2, 2022 at 14:08

OTheDev

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Comments

pandamoniark · Accepted Answer · 2022-05-02 13:38:14Z

0

If I understand properly what you are trying to do, you just need to append ptm[0] (i.e the first - and only - integer of the array ptm) instead of ptm.

answered May 2, 2022 at 13:38

pandamoniark

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2 Comments

Sarah Over a year ago

This returns the error: IndexError: too many indices for array: array is 0-dimensional, but 1 were indexed

pandamoniark Over a year ago

Indeed, I did not notice it was a 0-dimensional array. Appending int(ptm) should work.

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