291 Topics
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 | Years ago I wrote a program in Fortran for a structural analysis class. At the time I had very little programming experience and mottled my way through the assignment. Fast forward to now and I'm attempting to teach myself Python 3. I figured I'd would try to convert the old …  |
| | Hi everyone, I'm new to parallel programming, and my project is the two-dimensional matrix vector multiplication using mpi in C programming language. I have this multiplication function, but I don't know exactly how to run it with mpi. Can you help me, please? I write these commands, $ mpicc -g …  |
 | **A newbie would appreciate if someone could give him a pseudocode or any kind of explanation for the part of the code where the actual algorithm for matrix determinant is written.** using System; namespace Determinant { class Program { public static double DET(int n, double[,] Mat) { double d = … |
 | #include <iostream> using namespace std; void enterData(double firstMatrix[][10], double secondMatrix[][10], int rowSecondFirst, int columnCountFirst, int rowCountSecond, int columnCountSecond); void multiplyMatrices(double firstMatrix[][10], double secondMatrix[][10], double result[][10], int rowCountFirst, int columnCountFirst, int rowCountSecond, int columnCountSecond); void display(double mult[][10], double rowFirst, double columnSecond); int i, j, k; int main() { double firstMatrix[10][10], secondMatrix[10][10], … |
| | I'm trying to build my skills here. This code compiles and runs successfully if I go out of class. It crashes when I need to enter numbers for matrices. Can somebody explain to me why this crashes? #pragma once #ifndef matrixType_h #define matrixType_h template <class T> class matrixType { public: …  |
| | Following is a matrix multiplication code written in MPI (Message Passing Interface) which could be run on CPU cluster for parallel processing. This has been successfully tested with two square matrices, each of the size 1500*1500. |
| | can anyone show me how to write a 2 * 2 matrix multiplication program.  |
 | Hello to all programmers out there. Considering the growing request for practice problems by the beginners, we ( Me, Joey, Niek, Aaron..) have decided to start a sticky which will host some common practice problems which would help the beginners in understanding the programming concepts in a better way. (Did …  |
 | I have been learning NumPy arrays/matrices in Python. As I worked, I found that I desired a more readable form of 3d matrices. So I figured that writing one would be a good goal and learning exercise. The goal was to create a function that would print 3d NumPy matrices … |
 | I am working on a multi-level marketing (matrix type) web application for a friend. I need assistance with a code snippet for generating a tree view of the downlines and the income calculations. The width is 3 and depth is 4. Thanks  |
 | I've been here before but I'm looking to find a single-pass method to input the LRS `[[0,0,0],[0,0,0],[1,1,1]]` and get a basic 3x4 (at least) matrix in return: [ [1,0,0,0], [0,1,0,0], [0,0,1,0] ] ^ matrix is NOT transposed (I'll never understand why we use column-major) anyone got anything on this?? > … |
| | My professor assigned a problem from our OS book about matrix multiplication. Its pretty simple as the book shows how to do most of it. But now my professor has added an extra layer of difficulty. Instead of declaring the multidimensional arrays globally he wants us to input the size … |
| | **Problems 1: Spiral matrix - Advanced** Source of the problem: [Here (not in English)](http://www.spoj.com/PTIT/problems/BCACM11B/) Spiral matrix is formed by filling number 1 in 1st row 1st column, after that, filling with increasing number by clockwise, example: 1 2 3 4 5 16 17 18 19 6 15 24 25 20 …  |
 | For my own use, I'd like to develop a small Vector and a Matrix class, independent of some big libraries that exist out there. My question is: Should Vector and Matrix stay two independent entities or should I derive a Vctor frm a Matrix or a Matrix from a Vector? …  |
| | Write a program which finds the factorial of a number entered by the user. (check for all conditions) (Beginner). Create a program which generates fibonacci series till a number 'n' where 'n' is entered by the user. For eg. if the user enters 10 then the output would be: 1 …  |
| | Hi, I am multiplying two matricies in assembly. It is a 2 x 2, and as you can see they are defined down below in the code. I am also defining storate for 4 words so tht I can save the resulting matrix. 1. I declare offset fo each matrix …  |
| | I wan to wirte in cout << ... to have the matrix in output in the same format that I wrote it in text file like this: 1 2 3 4 5 2 3 4 5 6 3 4 5 6 7 class Classname { double data[3][3]; public: void Read(char … |
| | I have a 1000x24 matrix in a text file and i want to sum the adjoining columns of the whole matrix e.g. col1+col2, col2+col3, col3+col4,... col23+col24 and store these values in a separate text file. My code runs like this: #include <stdio.h> int main() { int i,j; float a[100][24]; FILE … |
 | I was doing the class tutorial to have matrix multiplication from two dimensional arrays: X (3x2) and Y (2x3). package t7; public class Q5 { public static void main(String[] args) { int[][] matrix_X = new int [3][2]; int[][] matrix_Y = new int [2][3]; int[][] result = new int [3][3]; for …  |
| | Hello, So I was testing my matrix class and the results look questionable and the inverted matrix isn't returning the vertex to it's original value (a seperate issue). Given a perspective projection at 45 degrees with a near of 1 and a far of 1000, the camera at the orgin … |
 | Hello, guys, I encountered a big problem. There is a genereted matrix of buttons: private void Single_Load(object sender, EventArgs e) { //code here for (int i = 0; i < n; i++) { for (int j = 0; j < n; j++) { //a lot of working code here b[i, … |
 | Hello all! Can someone help with this matrix? it needs to spiral inwards, from bottom right corner, clockwise... I found this code... and it runs nicely but I need to adapt it in some ways: - I should be able to provide number of rows and columns - the grid …  |
| | This Project is to implement some procedures doing the following: 1. Represent any graph using these input parameters: • A parameter to represent the graph by Adjacency Matrix, or Adjacency List. • A parameter to indicate whether the graph is directed, or undirected. • A parameter to indicate whether the … |
 | Optimizing Matrix Multiplication One time consuming task is multiplying large matrices. In this post we'll look at ways to improve the speed of this process. We'll be using a square matrix, but with simple modifications the code can be adapted to any type of matrix. The straight forward way to …  |
| | I have a base class called Matrix which has a function transpose. I also have a derived class Matrix2 which is inherited publicly from Matrix class Matrix { public: Matrix(); ... Matrix Transpose(void); ... }; class Matrix2 : public Matrix { public: Matrix2(); ... }; In my main code, I …  |
| | This is really simple. Just take the last letter of the movie name in previous post & put another movie name starting with that letter. Eg.:- if i put "The Matrix -Reloaded" answer may be "Doom" so let's start. I put : The Matrix Revolution  |
| | Hi, I have an assignment. I need to write code in logic programming language SWI-Prolog. Its very hard and I am going to appreciate if you help me :D. This is the assigment: Print 2D array size of (width x height) in spiral order. More explanation and example: You have …  |
| | Hello, So I'm aware that OpenGL is Column major and DirectX is Row major, but how does that translate into a basic 1D array? So given the below visual matrix, what would the first 3 in the array of each platform and which 3 would be the x,y and z … |
| | I have an mxn matrix, that is stored in memory in an array: matA = new float[m * n]; // ... Assign values matA[0] = 1; matB[1] = 2; // ... After I finish with this array, I then need to create very similar array to store a new mxn … |
| | Hi, I'm a beginner with Java, can anyone tell me where my error is, I'm sure there's something I'm missing here with the array logic: public void scalarMultiplication(int c) { for( int i=0; i <values.length - 1;i++){ for(int j=0; j < values.length - 1;j++){ values[i][j] = values[i][j] * c; } …  |
| | I was wondering if there is any way to do a single mysql query to do a count of filled positions in a multi-level structure to an indefinite depth. That sounds a bit cryptic, but this is what I would like to do if it is at all possible. we … |
 | can any body please tell me that how to take input size of a matrix in 2 d array an then print the table of it.... sample output 1 2 3 4 5 2 4 6 8 10 3 6 9 12 15 4 8 12 16 20 5 10 …  |
| | please help me i need a dynamic array that get the information as a matris and give me the vertex degrees (sum every row).and send it to another matrix. #include "stdafx.h" #include<conio.h> #include<iostream> #include <stdlib.h> #include <string.h> using namespace std; int _tmain(int argc, _TCHAR* argv[]) { int k,sum; cout << … |
| | I need to write a code that is gonna remove a whole row/column in a matrix(either static or dynamic matrix) |
| | Write a program that can do the following: addition of two matrices . subtraction of two matrices. multiplication of a matrix by a scalar. multiplication of a matrix by a matrix.  |
| | This Program prints the numbers in given array(Row-Major Order) in Spiral order. Ex: Order Is 3*4 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Spiral Order Of Matrix is 11 12 13 14 18 22 26 25 24 23 19 15 16 … |
| | I cant figure out how to check the array for AND and OR. please, help, i got stuck my code: import java.util.Scanner; public class BooleanProduct import java.util.Scanner; public class BooleanProduct { public static void main(String[] args) { Scanner input = new Scanner(System.in); int[][] A = new int[10][10]; int[][] B = … |
| | import java.util.Scanner; public class BooleanProduct { public static void main(String[] args) { Scanner input = new Scanner(System.in); int n = 10; int[][] A = new int[n][n]; int[][] B = new int[n][n]; //Fill A and B int m,n2,p,q; System.out.println("Enter number of rows for matrix A : "); m = input.nextInt(); System.out.println("Enter …  |
| | I have this code that outputs the tfidf for all words in each file in the directory. I'm trying to transfer this to a matrix where each row correspond to each file in the directory and each column to all words in the files and I have some difficulty in … |
| | Hi! I have this code, classes with matrices, overloading operator etc (this is just one part, I reduced it from original). #include<iostream> using namespace std; class matrix { protected: float* M; size_t m,n; public: matrix(){} matrix(size_t m,size_t n); matrix(const matrix& A); ~matrix(); matrix& operator=(const matrix& A); matrix operator+(const matrix& A) … |
| | Hello guys. I have queries, i made a matrix of Buttons and another of Panels and everythings is ok, that works. There is the code: private void button1_Click(object sender, EventArgs e) { for (int i = 0; i < 3; i++) for (int j = 0; j < 3; j++) … |
| | Hi, I have to create a program that creates N child processes, and they muliply the matrix. I have some base codes but when I try to run them they give me segmentation error and I cant find the problem. #include <stdio.h> #include <stdlib.h> #include <time.h> #include <unistd.h> #include <sys/types.h> … |
| | Hello, I am getting the error: "Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException:15" There is definetly something I am doing wrong but I cannot figure out what. Any help will be appreciated. The error in the output is poiinting to line 119; if(R[currentState][action] > -1){. I tried to change this but no … |
| | create a code that will determine if a given input is(matrix) is a diagonal matrix, square matrix, or not |
| | create a code that will read a file for an input which is a matrix,(rows and columns of the integers) and be able to output the transpose of it. original matrix 3X4 transpose matrix 4X3 1 2 3 4 1 5 9 5 6 7 8 2 6 0 9 … |
| | Hi. I found this code online: #include <stdio.h> #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> #include <sys/uio.h> #include <string.h> #include <stdlib.h> #include <ctype.h> /*********************************************************************** * Global Constants * ********************************************************************/ #define A_ROW 2 #define A_COL 3 #define B_ROW 3 #define B_COL 2 #define ARGUMENT_COUNT 13 #define PIPE_QTY 4 /*********************************************************************** * Global Variables … |
| | Hello folks, This nitty problem is haunting me today. Here is the code I have written, but am not getting the expected output. This is a program for printing matrix in spiral order. #include<stdio.h> #include<stdlib.h> int main() { int rows,cols,i,j; int tr=0,rc,br,lc=0; /* tr = top row index. rc = … |
 | How can we detect redundant rows.and maintain their count. if the rows are like 11111 11111 10101 11111 the result i want is 11111 4 10101 1  |
 | How do the numbers in a matrix relate to coordinates in 3D space. I've looked at a ton of tutorials for an answer but I still haven't come to an answer. They explain mainly the math which I try to use to answer my question, but I can't come to … |
| | (Continued from [here](http://www.daniweb.com/software-development/cpp/threads/474128/column-major-not-shown-right#post2070227) ) I am trying to use column major order to a 2d matrix which I am using as 1d. int N=3,R=2; for (int i=0;i<N;i++){ for (int j=0;j<R;j++){ //printf("\nX[%d]=%d\t",i+j*N,res[i+j*N]); //column major // printf("\nX[%d]=%d\t",i*R+j,res[i*R+j]); //row major } printf("\n"); } but the column major doesn not work as it should. … |
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