Numpy-ndarray Questions

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Occurrence of list in ndarray

I have an rgb image -ndarray- and i want to count the occurrence of some colors like [255,0,0] or [0,0,255] in this image. example of
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Stretch an array and fill nan

I have a 1-d numpy array with length n, and i want to stretch it to m (n<m) and systematically add numpy.nan. for example:
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How to connect Python arrays

I don't understand when it is sum operation or just connect two arrays x = np.arange(10) x #array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
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