Jun 17, 2011 · You can even add pairwise exponentiation, negation, binary operations, etc. I do not demonstrate it here, because it's probably best to leave * and ** for matrix multiplication …

Nov 11, 2013 · len(a[0]) - number of columns (since this is a matrix, the length of a[0] is the same as length of any a[i]). This way, i is the number of row, j is the number of column and …

Feb 10, 2018 · new to Python, struggling in numpy, hope someone can help me, thank you! from numpy import * A = matrix('1.0 2.0; 3.0 4.0') B = matrix('5.0 6.0') C = matrix('1.0 2.0; 3.0 4.0; …

Jul 12, 2011 · Long back when I was not comfortable with Python, I saw the single line answers for writing 2D matrix and told myself I am not going to use 2-D matrix in Python again. (Those …

And if you care about performance, np.concatenate is the real war horse. In [215]: %timeit np.concatenate((A, B), 1) The slowest run took 12.10 times longer than the fastest. 100000 …

A third solution that is simpler (for me) to understand conceptually, but less efficient computationally is to use repmat to expand matrix A to the size of matrix B. C = …

Dec 22, 2020 · However, python says. ValueError: all the input arrays must have same number of dimensions, but the array at index 0 has 2 dimension(s) and the array at index 1 has 4 …

I want to append a vector to a matrix in python. I tried append or concatenate methods but I didn't get the answer. I was previously working with Matlab and there I used this: m = zeros(10, 4) % …

Sep 28, 2015 · I found the numpy.c_ function pretty handy at adding a column to an matrix. The following code would add a column with all zeros to the matrix. import numpy as np …

I'll try to be as clear as possible, and I'll start by explaining why I want to transform two arrays into a matrix. To plot the performance of a portfolio vs an market index I need a data structure like …