Free Interactive Python Tutorial

Given: R is an mxn float matrix Output: O is an mxn matrix where O[i,j] = R[i,j] if (i,j) is a loca… Read more Python: Faster Local Maximum In 2-d Matrix

I have a 3D matrix in python as the following: import numpy as np a = np.ones((2,2,3)) a[0,0,0] = … Read more Converting 3d Matrix To Cascaded 2d Matrices

I create an arbitrary 2x2 matrix: In [87]: mymat = np.matrix([[2,4],[5,3]]) In [88]: mymat Out[88]… Read more Eigenvectors Created By Numpy.linalg.eig Don't Seem Correct

In numpy, I have an array of N 3x3 matrices. This would be an example of how I'm storing them (… Read more Multiple Matrix Multiplication

I have the following numpy row matrix. X = np.array([1,2,3]) I want to create a block matrix as fo… Read more What Is The Best Way To Create A Block Matrix Form A Row Vector?

a = np.asarray([1,2,3]) b = np.asarray([2,3,4,5]) a.shape (3,) b.shape (4,) I want a 3 by 4 m… Read more Python: Multiply Two 1d Matrices In Numpy

I am trying to find the fastest way to perform the following pairwise distance calculation in Pytho… Read more Calculate Weighted Pairwise Distance Matrix In Python

I'm searching for an efficient way to create a matrix of occurrences from two arrays that conta… Read more Fill Matrix Of Occurences From Column/row Arrays Of Indexes

How do I take a matrix such as: matrix = [[2,0,2],[0,2,0],[2,0,2]] and transform it to [[4,0,4],[0,… Read more Python Matrix Manipulation - Square Each Element

I have 2 big matrices: Xn = np.matrix(X) Xnt = Xn.transpose() Then Xn is like this: … Read more Numpy Matrix Multiplication Error

I have the following matrix A in R: # [,1] [,2] [,3] [,4] # [1,] -1.152777… Read more Inconsistent Results Between Lu Decomposition In R And Python

I've been trying to optimize my computations; and for most operations that I've tried, tens… Read more Time Comparison For Tensorflow Operation And Numpy Multiplication

I'm new to Python and I have a solution for this but it seems slow and silly, so I wondered if … Read more Python: Writing Large Array Of Arrays To Text File

In Python I need to find the pairwise correlation between all features in a matrix A and all featur… Read more Efficient Pairwise Correlation For Two Matrices Of Features

I have two matrices [A](Expected_matrice) , [B](Predicted_matrice) I need to create the third one [… Read more How Can Display Differences Of Two Matrices By Subtraction Via Heatmap In Python?

How can I get a matrix which has as diagonal some matrices that I have in a list? I can get this if… Read more Scipy Block_diag Of A List Of Matrices

I don't know if the title makes any sense. Normally an identity matrix is a 2D matrix like In [… Read more What's The Best Way To Create A "3d Identity Matrix" In Numpy?

I have defined two matrices like following: from scipy import linalg, mat, dot a = mat([-0.711,0.73… Read more Calculate Cosine Similarity Of Two Matrices

I have this: In [1]:a = sc.parallelize([a,b,c]) In [2]:a.cartesian(a).collect() Out[3]: [(a, a), (a… Read more Spark Unique Pair In Cartesian Product

I have searched around and tried to find a solution to what seems to be a simple problem, but have … Read more Sort A Numpy Python Matrix Progressively According To Rows