In R with a matrix: one two three four [1,] 1 6 11 16 [2,] 2 7 12 17 [3,] 3 8 11 18 [4,] 4 9 11 19 [5,] 5 10 15 20 I want to extract the submatrix whose rows have column three = 11. That i...

I'm currently working on a MATLAB project and I'd like to re-implement the most computational-heavy parts using C++ and Eigen. I'd like to know if there's a way to perform the following operation (...

I would appreciate any help, to understand following behavior when slicing a lil_matrix (A) from the scipy.sparse package. Actually, I would like to extract a submatrix based on an arbitrary index...

I have several processes, each computing its own matrix. Finally, I want them to send their solved matrices to the root process, which will literally join them into one big matrix and output this s...

I have already looked at how to get sub image by using OpenCV in java api, but this did not help I am curious how to create a sub image of a Mat image that I have loaded in from a file. When I run...

I have an N*N matrix (N=2 to 10000) of numbers that may range from 0 to 1000. How can I find the largest (rectangular) submatrix that consists of the same number? Example: 1 2 3 4 5 -- -- -- --...

I am a very basic user and do not know much about commands used in C, so please bear with me...I cant use very complicated codes. I have some knowledge in the stdio.h and ctype.h library, but thats...

Input: A 2-dimensional array NxN - Matrix - with positive and negative elements.Output: A submatrix of any size such that its summation is the maximum among all possible submatrices. Requirement: ...

I'm looking for an elegant solution to this very simple problem in MATLAB. Suppose I have a matrix >> M = magic(5) M = 17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2...

I have got an N×M matrix m like: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 I want to get all submatrices of size P×Q (P,Q are odd) w/o employing a for-loop. The result s should be a P×Q×((N-P+1...

Say in Matlab I have a matrix like this: 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 I now need to find submatrixes 3x3 around eve...