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I want to be able to 'build' a numpy array on the fly, I do not know the size of this array in advance.
For example I want to do something like this:
a= np.array() for x in y: a.append(x) Which would result in a containing all the elements of x, obviously this is a trivial answer. I am just curious whether this is possible?
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You can use a list in python, you can use the list. append(item) method in order to insert new elements into it, you don't have to specify the size of the list in order to use it and it will grow as your append more items.
Build a Python list and convert that to a Numpy array. That takes amortized O(1) time per append + O(n) for the conversion to array, for a total of O(n).
a = [] for x in y: a.append(x) a = np.array(a) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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