but this requires me to know how many dimensions the original array has (and concatenate [0]'s when working with higher dimensions) Is there a dimensions-independent way of getting a column/row vector from an arbitrary ndarray?

Sep 25, 2012 · I want to convert a 1-dimensional array into a 2-dimensional array by specifying the number of columns in the 2D array. Something that would work like this: > import numpy as np > A = np.arr...

Oct 29, 2022 · In Python, the extend() method can be used to flatten a nested list into a 1D list efficiently. This method appends the elements of each inner list to an outer list.

Jan 19, 2021 · I have three 2D np.array that mathematically are [8:1550] matrices, and I want to express them into 1D np.array of 12400 numbers (8 x 1550 = 12400...) so that I could create a DataFrame later with ...

Jun 15, 2020 · @High-Octane, he does call it an array, and use a [numpy] tag. And the display (s) is normal for numpy arrays, not lists. In numpy reshape (and ravel) produces a view (usually), which is fast and memory efficient. Your flattener may be nice for lists, but will be slower when applied to a numpy array (if it works at all :) ).

Mar 25, 2015 · If the goal is to do something without Numpy, then it isn't a Numpy question and shouldn't be tagged that way. That said, it seems strange to expect Numpy to be helpful here, since the inputs aren't the same length and thus there's no approach involving a rectangular array. Sure, the elements shown here are all integers, but they'd have to be boxed anyway unless we start with Numpy arrays.

Aug 30, 2018 · I am new to python and need to do the following thing: I've given an 1d array of vectors (so pretty much 2d). My task is to create an 1d array that contains the length of each vector. array([[0....

Dec 2, 2016 · You can use some simple and direct Python and get a list (or whatever) of tuples: list(map(tuple, arr)) where map() simply applies tuple() to each line of the array in turn.

Sep 7, 2017 · I have a simple 2D dataframe with index and columns. I need to export it to an excel file by using my colleague's layout, e.g. a single row with a multiindex columns of 2 levels.

Aug 9, 2016 · I have a 2D Numpy array that I would like to put in a pandas Series (not a DataFrame): >>> import pandas as pd >>> import numpy as np >>> a = np.zeros((5, 2)) >>> a array([[ 0., 0.], [ 0., 0.], [ 0., 0.], [ 0., 0.], [ 0., 0.]]) But this throws an error: >>> s = pd.Series(a) Traceback (most recent call last): File "<stdin>", line 1, in <module>