# Matrix « algorithm « Java Collection Q&A

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 Java Collection Q&A » algorithm » Matrix

### 1. Fast counting of 2D sub-matrices withing a large, dense 2D matrix?    stackoverflow.com

What's a good algorithm for counting submatrices within a larger, dense matrix? If I had a single line of data, I could use a suffix tree, but I'm not sure if ...

### 2. How to get predecessor and successors from an adjacency matrix    stackoverflow.com

Hi I am am trying to complete an assignment, where it is ok to consult the online community. I have to create a graph class that ultimately can do Breadth ...

### 3. Java array of arry [matrix] of an integer partition with fixed term    stackoverflow.com

for my study purpose I need to build an array of array filled with the partitions of an integer with fixed term. That is given an integer, suppose 10 and given ...

### 4. Best way to get the highest sum from a Matrix (using Java but algorithm is the issue here)    stackoverflow.com

Sorry I dont know the correct terminology to use but I have a 3x3 matrix like this

``````1 3 4
5 4 5
2 2 5
``````
and I want get ...

### 5. What is Chain Matrix Multiplication?    stackoverflow.com

I am trying to understand what is a chain matrix multiplication and how it is different from a regular multiplication. I have checked several sourcers yet all seem to be very ...

### 6. enumerate grouped columns vertically    stackoverflow.com

If I have a matrix that is iterated horizontally and then vertically it would enumerate like this:

``    0  1  2  3  4  ...``

### 7. Simple Algorithm for Matrix Inverse    stackoverflow.com

I want to implement a program to calculate the Inverse of a matrix in F(2) (only 0 and 1) . Please let me know if you can think of any algorithm ...

### 8. Gaussian Elimination in Java    stackoverflow.com

I was trying to implement a Matrix.class to learn some Java. Right now, I have some difficulties with a method that should return the matrix after Gaussian elimination which will be used ...

### 9. Circle selection in an Integer[][] matrix - Java    stackoverflow.com

I have a matrix with n columns, n rows and every element is initialized with 0. I want to select the largest circle in that matrix, and set the values to 1.

``````000010000
000111000
000111000
001111100
011111110 ...``````

### 10. Is there a java library that implements Strassen's algorithm for matrix inversion?    stackoverflow.com

I am working on a project that compares the various matrix inversion algorithms (Gauss-Jordan, Strassen, and Coppersmith-Winograd). I have found gauss-jordan implementations, but I have not been able to find any ...

### 11. algorithm for adding the diagonals on a square or rectangular matrix, starting rightwise    stackoverflow.com

I want to add the diagonals in a square or rectangular matrix to emulate the process of adding the partial results in a multiplying algorithm. Like this:

``````     2412
...``````

### 12. Longest Increasing Sequence 2D matrix recursion    stackoverflow.com

I have been presented with a new homework assignment that has been somewhat frustrating to say the least. Basically, I have a create a 2D array of integers as follows:

``97 47 ...``

### 13. resize binary matrix    stackoverflow.com

I have a matrix

``````0 1 0 1 0
0 1 1 0 0
0 1 1 0 0
``````
and i have to resize it like image
``````0 0 1 1 0 1 0
0 0 1 ...``````

### 14. find all local maximum from the matrix    stackoverflow.com

Please write a method in Java which will receive as input a matrix (int[][] matrix) and which should find all local maximum from the matrix. A local maximum is such a ...

### 15. Finding all possible unique arrays within a matrix    stackoverflow.com

When given a square matrix, what would be the best way to find all of the possible arrays within it without using more than one element from any row/column in each ...

### 16. algorithm - determine if there are diagonals of a certain size with the same value in a matrix    stackoverflow.com

I can't figure out how to handle the following situation: I have a `9*9` matrix, and a given element of the matrix. I want to find out if the element is ...

### 17. Algorithm: matrix S shape trace    forums.oracle.com

About that S-walk (which is not really an 'S' but rather a '2'), how would that go in case of a row-matrix (a 1*n matrix) or a 2*2 matrix? What purpose does it serve to visit only a part of the elements of a matrix? What do you mean by "very hard matrix algorithms"? But more importantly: what is your goal ...