# Tag: matrix

## how to randomize a matrix keeping the rows fixed in python

I’m trying to randomize all the rows of my DataFrame but with no success. What I want to do is from this matrix to this I’ve tried with np. random.shuffle but it doesn’t work. I’m working in Google Colaboratory environment. Answer If you want to make this work with np.random.shuffle, then one way would be to extract the rows into

## Divide matrix into submatrix python

The program must accept an integer matrix of size R*C and four integers X, Y, P, Q as the input. The program must divide the matrix into nine submatrices based on the following condition. The program must divide the matrix horizontally after the Xth row and Yth row. Then the program must divide the matrix vertically after the Pth column

## resolve matrix lists with lambda and map

we have 3 lists in below so , how we can sum all of similar index in lists together? i mean is 2 and 5 and 8 be sum together & 3 and 6 and 9 also be sum together & 4 and 7 and 10 as well ? but just use lambda and map… actually i have no idea

## Iterate through an adjacency matrix with a list

So I have a n x n adjacency matrix, N x N NumPy array, where the i-th row and the j-th column is the distance between the i-th and j-th cities. I also have list, in a specific order in which I have to visit the cities and and add the distances together. The list items are pointing to row/column

## Pythonic way to “condense” a matrix

If I have the following matrix, which the input format is a list of lists: B T E 0 1 0 0 1 1 0 2 1 1 2 0 How can I construct the following python matrix: 0 1 D = [[{1}, {1,2}], 0 …

## Integer overflow while calculating all possible sums of n*m matrix rows

I am using this code to compute all possible sum of a n x m matrix. The code is working absolutely fine and it is fast too when using arrays of 32-bit integers like [[777,675,888],[768,777,698]]. It …

## Insert matrix inside another matrix using numpy without overwriting some original values

I need to insert a matrix inside another one using numpy The matrix i need to insert is like this one: tetraminos = [[0, 1, 0], [1, 1, 1]] While the other matrix is like this: board = …

## create a matrix from combinations with values

I have some combinations like (A,B) = 1 (A,C) = 0 (A,D) = 1 (B,C) = 1 (B,D) = 1 (C,D) = 0 Any idea on how I efficiently can create a four by four matrix with these 0,1 values from all these …

## comparing a number of lists in pairs

I have problem with 4 list each one got 4 number: P1= [3,1,3,4] P2= [5,4,3,7] P3= [7,4,8,1] P4= [10,3,2,1] I need to get the biggest number in combinational way like: Pair of 2: p1p2, p1p3, p1p4, …

## Python Numpy make a pattern with a square matrix of any dimension

I am having difficulties trying to generate a specific pattern that would work for any square matrix with any square dimension using NumPy For example: User input: n = 3 Output: [[1 2 0] [2 3 2] [0 …