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pythonarraysnumpy
ShanZhengYang
ShanZhengYang

Reputation: 17641

Find the lengths of list within numpy ndarray

I have a numpy array arr which is shaped (100,)

  arr.shape()  #(100,)

here are 100 lists within this array. The lists are strings of characters with no spaces, around length 30

'TBTBBBBBBBBBEBEBEBEBDLKDJFDFIKKKKK'

This array has a "matrix-esque" shape. How can I either (a) tell the lengths of each of the lists in this array or (b) reformat this array so that arr.shape() gives me two dimensions, i.e. arr.shape() gives (100,30)?

Also, it may not be that every list is of the same length (some may be 28, not 30):

How can I check for this behavior? What will numpy.shape() output in such a case?

Upvotes: 3

Views: 6657

Answers (1)

Alexander
Alexander

Reputation: 109686

You can use a list comprehension to determine the length of each string in the array:

arr = np.array(['aasdfads', 'asfdads', 'fdfsdfaf'])
>>> [len(i) for i in arr]
[8, 7, 8]

Or take the max:

>>> max([len(i) for i in arr])
8

Upvotes: 4

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