291 Topics
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| | Hi! I am using the Boost uBlas interface for matrices and I'd like to be able to create matrices with the following syntax (or similar): [CODE] typedef boost::numeric::ublas::matrix<double> Matrix; //for clarity Matrix mat = {[1,1,1],[2,2,2],[3,3,3]}; [/CODE] The actual matrix should be 3x3 and look like the following - 1,1,1 2,2,2 … |
| | Hi everyone, Can someone help me to solve this question? im attaching the question as i cant post the matrix here. Thank you  |
 | I finally got this exercise working and i just need someone to tell me im awesome. Or just some feedback or tips on what i can improve(probably alot:)).[QUOTE]Write a program which performs addition, subtraction, multiplication of matrices. The dimensions of both the matrices would be specified by the user (dynamic … |
| | [CODE] for (int i = 1; i <= numberofmatricesrequired; i++) { string number = Convert.ToString(i); Matrix (matrixnumber+number) = new Matrix(matrixsize, matrixsize); } [/CODE] Basically I have x amount of matrices I need to establish of y by y size. I was hoping to name the matrices: matrixnumber[B]1[/B] matrixnumber[B]2[/B]..matrixnumber[B]n[/B] I cannot … |
| | Hi, I have the following files and can match but, am having trouble with getting the output to write correctly to a data matrix format that I need and would appreciate any help with getting the code right. File 1 has a list of numbers and Files 2, 3 and … |
| | This is as much of a question about algorithm as it is about code. I’m training monkeys to input data into a keyboard in the form of a table. I have created a special keyboard with nothing on it but numbers 0 - 9, a period, tab key and a … |
| | Ok so I have an operator* for left scalar matrix multiplication that is correctly outputting for the first 4 outputs and not for the next 4. If I have a matrix M2 with inputs [1,2;3,4;5,6;7,8] (the semicolon means next column), and multiplying it by 4, then I am getting the …  |
| | I have this 2d array that sorts the rows but i can't sort the column.. i can't figure it out for the life of me. PLEASE HELP Please enter size of row between 1 - 20: 5 Please enter size of column between 1 - 20: 5 Your matrix is … |
| | Hi everyone: I have written C++ code for populating a matrix/2D array with calculation results. Each column of the array represents results for a distinct time step. My problem arises because the rows of my results vector do NOT correspond to the rows of the matrix. The matrix includes extra … |
| | Hey, Im trying to write a program that using gauss-jordan elimination to solve a set of linear equations.It reads in two files names for matrix A and C. I have to first form an augmentes matrix (A|C) and then do the elimination.Can any one help me by telling how to … |
| | Hi, I am attempting to create a dynamic array using realloc in 2 dimensions. Currently i have managed to get it to work using realloc to dynamically resize the amount of rows but when I attempt to use realloc to dynamically resize the amount of columns per row I keep … |
| | I need to write a program, which shows the different combinations in which matrices can be multiplied. The output should look like below : When there are two matrices multiplied there is one combination (XX) When there are three matrices multiplied there are two combinations (X(XX)) ((XX)X) When there are …  |
| | Hey. I need a method that creates a matrix from an array, for instance: ({10, 11, 12, 13}, 2) should return {{10, 11, 12}, {13}}. [code]public class Matrix{ public static int[][]toM(int[] array, int a){ int[][]matrix = new int [(array.length)/a][a]; for (int i = 0; i < array.length; i++){ int value … |
| | Hi everybody! Sorry for my bad english! I have a matrix of integers with a maximum length 6 digits. I must to write program, that checks whether a number is found in the section above the main secondary diagonal of this matrix. I'm beginner in C + + and I … |
| | Hi guys, I'm implementing a viewer for skinned character animation. Each frame of animation requires thousands of (4x4 matrix * vector) and (float * 4x4 matrix) calculations. This is the section that is repeated thousands of times: [code] // For each vertex influenced by bone for (int j=0; j<(int)Character::bones[i].get_vertices().size(); j++) … |
| | Hello everyone: I am a C++ newbie. I have used Matlab to fill the rows or columns of a matrix with values from a vector and I'm wondering how to do the same thing in C++... I have written code that puts new values in a vector. This happens in … |
| | hello i am trying to do matrix multiplication on a 2D array using pitch. i am able to load the 2D array on gpu using cudaMallocPitch() and cudaMemcpy2D() function, but i am not able to write the multiplication code. The output which i am getting is wrong. Can anyone help … |
| | I need to write a program that displays a single character in all possible combination of foreground and background [U][COLOR="Green"][COLOR="Red"]colors [/COLOR][/COLOR][/U](16x16 = 256). The colors are numbered from 0 to 15, so use a [COLOR="Red"]nested loop[/COLOR] to generate all possible combinations. The character to be displayed should be obtained from … |
| | Hello. First of all I'd like to say HI to everyone. I've recently joined this community and this is my first post. I have a class called Numerical Calculus where the assignments often require the input and representation in a GUI of various matrices. So I've been looking for ways … |
| | Hello, I am writing a program that does matrix Multiplication using 2-dimensional arrays and a Matrix Class. The program compiles without any errors but when I get to the part of the program where it actually multiplies the 2 matrices it throws an exception. I've looked through the code several …  |
| | So guys for the sake of simplicity lets say i am developing a huge matrix multiplication program using C and i made a data structure which is able to represent this huge matrix into miniature blocks the down side is that this representation of block takes much more memory than … |
| | C program to perform Matrix operations such as Addition, Subtraction, Multiplication and Transpose according to the user’s choice. displaying following menu. ------------------ MAIN MENU ------------------ 1. MATRIX ADDITION 2. MATRIX SUBTRACTION 3. MATRIX MLTIPLICATION 4. MATRIX TRANSPOSE 5. TO EXIT --------------------------- Please enter your option <1/2/3/4/5>: The program should ask … |
| | Hello i was wondering how to store a tridiagonal matrix in c++ i know i have to use three arrays for the upper lower and diagonal terms, but how do i then use parenthesis operator to access single elements of the matrix when it is stored as three separate arrays....also …  |
| | Hi, I'm trying to find a way to calculate the eigenvalues and eigenvectors for a square symmetrical matrix. I have used MATLAB to do this before and the solution was as simple as; [V,D] = eig(A) I'm wondering if there is a simple solution like this in c++. I am … |
| | I'm trying to use matrix multiplication to multiply b onto a. Using the method I've written below, changes the values of matrix A which I've then realised messes up later calculations. Would the best way to get around this be to make two copies of the matrices A and B … |
| | I have a 3x3 matrix with values: (0,0)=3 (1,1)=4 (2,0)=2.4 the rest of the values are zero and the code: [CODE]#include <iostream> using namespace std; class sMatrix { public: sMatrix(); sMatrix(int,int); int getR(); int getC(); bool rValid(int); bool cValid(int); void setEl(int,int,double); double getEl(int i,int j); void print(); private: int nr, … |
| | I need this for matrix multiplication, I'm putting any 2 dimensional matrix into 1 dimension by column major order, i.e. the matrix 1 2 3 4 is stored as [1 3 2 4]. To try and figure it out I've worked out the pattern for 2x2 matrices: [code=php] data_[1] = …  |
| | I'm using the header file below. I'm a little confused about how to store any matrices I create... If I do: [code=php] int main() { Matrix A(2, 3); Matrix B(3); return 0; } Matrix::Matrix(int mdim_, int ndim_) { data_.resize (mdim_*ndim_); for (int i = 0; i < mdim_*ndim_; i++) { …  |
| | hi every one........... i'm new in this forum and need ur help please.... i want to write a programme using c++ code, programme that find the optimal parenthesization of a matrix-chain product, then perform the optimal matrix -chain multiply 4 a sequence of matrices, but the user should enter the … |
| | Hi, I'm very much a beginner to C++, but I've been assigned a project outside of my programming class that is starting to get tricky. I'm modelling a layered optical system and I need to create N two-dimensional arrays (2x2 matrices to be used in matrix multiplication), where N is … |
| | Could someone please advise me on how to implement fork() in a parallel processing (multiplying) of a 2d array....I have been at this for far too long.. here is my code [code] for (int i = 0; i < rowCol[0]; i++ ) result[i] = (float*)malloc ( rowCol[1] * sizeof(float) ); … |
| | Can any one point out links to some small projects w.r.t C++ ? Now when I say small projects, It [B]doesn't mean[/B] building a calculator or matrix multiplication programs, [B]nor[/B] does it mean building games, [B]nor[/B] does it mean dealing with databases, What I actually want is to use the …  |
| | Practise problem by ~s.o.s~ Q. Write a program which performs addition, subtraction, multiplication of matrices. The dimensions of both the matrices would be specified by the user (dynamic memory allocation required). Use of structure or a class to define the matrix would be a good idea. (Expert) [CODE]#include<iostream> using namespace … |
| | [B]i need c program for [/B] [B]1.[/B] "[B]menu driven in c program using pointers[/B]. [COLOR="Red"]1.comparition of two strin , 2.length of two string, 3.reverse, 4.palindrome all without using string function" [/COLOR] [B]2.[/B] "[B]menu driven program using pointer with array[/B]. [COLOR="Red"]1.addition of two matrix, 2.subtracion of two matrix, 3.multiplication of matrix, …  |
| | Hii, The problem statement i am referring to is: Buttons Each cell of an N x N grid is either a 0 or a 1. You are given two such N x N grids, the initial grid and the final grid. There is a button against each row and each … |
| | I need help on getting started with a simple program. I made the mistake of taking too long between classes and it has slipped my mind. Design and implement an abstract data type for a matrix of integers. Include a function that will multiply two matrices. Write a small driver … |
| | in this code i did matrix multiplication 1. it accepts size of the matrix 1 . 2 . i used functions for enter matrix from user and print it. problem is that....it is printing garbage elements...[code]#include<stdio.h> #include<conio.h> void mx_enter(long int **arg,long int a,long int b) { long int i,j; arg=(int … |
| | write a program that will multiply two dimentional arrays as follow: 1. The program should prompt the user for the dimention of the first array (row x coloum). 2. The program should get the values of the first array one by one. (e.g. program should display "enter value of a[1][1]= …  |
| | please can any one help in this by mips :(quickly) You have to write a MIPS program that multiplies two 3x3 matrices. The two matrices are defined for you in the code. The program then prints the two matrices and their product. You should use loops to navigate through the … |
| | I am having a problem with overloading an operator within a class structure. Below is the program that illustrates my problem. It defines a class Matrix, creates two matrices and multiplies them. I created to multiplication functions. The first is a straight function, the second uses the overloaded * operator. … |
 | Hey Everyone, I have written this Matrix Multiplication program. But The Program seems to crash when during the filling of the first matrix, exactly after the completion of the first row. Here is my implementation [code] #include <iostream> using namespace std; void generate (int ** ,int ,int); void fill (int … |
| | Dear all, is there is a way to go trough a matrix using just one "for" loop?, I mean I have this snippet: [CODE] #define WIDTH 5 #define HEIGHT 3 int mat [HEIGHT * WIDTH]; int n,m; int main () { for (n=0;n<HEIGHT;n++) for (m=0;m<WIDTH;m++) { mat[n*WIDTH+m]=(n+1)*(m+1); } return 0; … |
| | #include<stdio.h> #include<conio.h> void main() { int a[10][10],b[10][10],c[10][10],i,j,k,m,n,p,q; printf("Enter The Rows And Cloumns in the Matrix:"); scanf("%d %d",&m,&n); printf("\nEnter Elements Of The Matrix:\n"); for(i=0;i< m;i++) { for(j=0;j< n;j++) { scanf("%d",&a[i][j]); } } printf("The First Matrix Is:\n"); /* Print the first matrix */ for(i=0;i< m;i++) { for(j=0;j< n;j++) printf(" %d ",a[i][j]); printf("\n"); … |
| | void main() { int a[10][10],b[10][10],c[10][10],i,j,k,m,n,p,q; printf("Enter The Rows And Cloumns And Of The First Matrix:"); scanf("%d %d",&m,&n); printf("\nEnter The Rows And Cloumns And Of The Second Matrix:"); scanf("%d %d",&p,&q); printf("\nEnter Elements Of The First Matrix:\n"); for(i=0;i< m;i++) { for(j=0;j< n;j++) { scanf("%d",&a[i][j]); } } printf("\nEnter Elements Of The Second Matrix:\n"); … |
| | Can someone help me with this problem... A is an m*n matrix B is an n*p matrix product AB is an m*p then I have to write a function void matrix product that takes two matrices of integers as two separate arguments and then calculates the product of those matrices … |
| | Hey, so I have to make a program that has to multiply two 3x3 matrices (among other things). I used classes to do the project, but I just can't seem to get this multiplication to work. Here is my code so far: [code]void matrix::mult(const matrix& u) { double c[9]; double … |
| | So i am writing a simple prgm in which you enter the values of 2 matrices and multiplies them. [code] #include<iostream> #include<iomanip> #include<cmath> using namespace std; int main() { int i, j , k , l, m , n , o, p; cout<<"Enter The Rows And Cloumns And Of The … |
| | ran into a problem i know this is asking for me to calculate the product of a coulmn and row but im not sure where to begin. I know that rowData tells us the value in a row and nRows specifies the number of rowData and the same with nCols … |
| | im working on a program for my exams and its not really working.....cant really figure out why........i ran my program in both borland and turbo.....and both are giving the same error......DECLARATION SYNTAX ERROR. [CODE]void mul(int a[][3],int b[][3]) {int k=0; for (i=0;i<3;++i) { for(j=0;j<3;++j) { c[i][j]=0; for(k=0;k<3;++k) c[i][j]=c[i][j]+(a[i][k]*b[k][j]); //Multiplication of two … |
| | when i compile i get an error message saying the following "51: error: assignment of read-only location" line 51 reads: c[i][j] = a[i][j] + b[i][j]; any help to get rid of this problem???[code]#include <iostream> #include <iomanip> using namespace std; #define N 3 void addMatrix(const double a[][N], const double b[][N], const … |
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