Convert NumPy array to Python list
Use tolist(): >>> import numpy as np >>> np.array([[1,2,3],[4,5,6]]).tolist() [[1, 2, 3], [4, 5, 6]] Note that this converts the values from whatever … Read more
numpy
What is the difference between np.array() and np.asarray()?
The definition of asarray is: def asarray(a, dtype=None, order=None): return array(a, dtype, copy=False, order=order) So it is like array, except it has fewer … Read more
How do I convert a PIL Image into a NumPy array?
You’re not saying how exactly putdata() is not behaving. I’m assuming you’re doing >>> pic.putdata(a) Traceback (most recent call last): File “…blablabla…/PIL/Image.py”, line … Read more
How do I create an empty array and then append to it in NumPy?
That is the wrong mental model for using NumPy efficiently. NumPy arrays are stored in contiguous blocks of memory. To append rows or … Read more
How do I add an extra column to a NumPy array?
np.r_[ … ] and np.c_[ … ] are useful alternatives to vstack and hstack, with square brackets [] instead of round (). A … Read more
Pretty-print a NumPy array without scientific notation and with given precision
Use numpy.set_printoptions to set the precision of the output: import numpy as np x = np.random.random(10) print(x) # [ 0.07837821 0.48002108 0.41274116 0.82993414 … Read more
How do I count the occurrence of a certain item in an ndarray?
How do I count the occurrence of a certain item in an ndarray?
How do I access the ith column of a NumPy multidimensional array?
To access column 0: >>> test[:, 0] array([1, 3, 5]) To access row 0: >>> test[0, :] array([1, 2]) This is covered in … Read more
How do I print the full NumPy array, without truncation?
Use numpy.set_printoptions: import sys import numpy numpy.set_printoptions(threshold=sys.maxsize)
Windows Scipy Install: No Lapack/Blas Resources Found
I am trying to install python and a series of packages onto a 64bit windows 7 desktop. I have installed Python 3.4, have … Read more
