[matrix-multiplication] Forum Topics

Ok, just as my topic says, I'm having trouble why it cannot consider negative multipliers. Code below: [CODE]//Multiplication by Repeated addition #include<stdio.h> main() { int k, l, m, n; printf("Enter Multiplicand: "); scanf("%d", &k); printf("Enter Multiplier: "); scanf("%d",&l); n=0; for(m=0;m<l;m++){ n=n+k; } printf("Result is: %d", n); printf("\nThank you for using …

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 …

1 5 7 3 2 4 6 8 9 if i add the diagonal the sum is (1+2+9=12) one more diagonal (7+6=13) i dint include 2 because its already added...want the out put 12+13=25 can anyone tell me c# code for this plz

I should find max in a multidimensional array. But, the elements of the array are given by keyboard, and so is the size of the array. The elements are integers. So, is this correct: ;message for the user to enter the size ;reading the size i equ -1 j equ …

I want a list that include matrixes (not implementing matrix as a list) . and I will add matrixes when I want. Is it the best way to take a dymamic memory with matrix size(row*column) and add the pointer that reference matrix to the list. But in this way, if …

I am a student, doing a project on superposition(bioinformatics). I am doing the part on rotation using matrices and I'm stuck. I need to open a visualizer (jmol) and adjust the angles of my protein structure at the same time via java codes. So I need to have 2 protein …

Guys I am seeking help on the following two dimensional arrays, using matrices. (a) Enter elements of two matrices A and B. (b) Add the matrices and store the result in matrix C. (c) Subtract matrix A from matrix B, and store the result in matrix R.

If i have a 2D matrix of characters or integer or whatever!How do i check if another matrix is a sub-matrix of The 2D one ...Please!! help with simple code that work for any size of the matrices Thanks in advance to all .

i have a 2D matrix of characters or integer or whatever!How do i check if another matrix is a sub-matrix of The 2D one ...Please!! help with simple code that work for any size of the matrices Thanks in advance to all

[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 …

matrix opration in c++

How do implement a class that displays a 2 by 2 matrix

I am using operator to add two matrices stored inside matrix objects. I instantiate and initialize two matrices. Then I call operator to add them. But before adding the two matrices: m1 and m2 , their destructors gets called. When I start adding the matrices since m2 matrix array has …

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 …

We must multiply matrices that are comprised of the 3 x 4 matrix and 4 X 2 matrix. 1 2 -2 0 -1 3 -3 43 -3 4 7 2 X 0 9 = 18 60 6 0 3 1 1 -11 1 -20 4 -5 We must hard code …

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 …

Hi all, I think I have a fairly basic question. I have a matrix and I would like to find the eigenvalues and eigenvector. In both MatLAB and Python (pylab) I can use the eig() function. Can anyone explain the reason for the differing answers? [CODE]MatLAB Code >> A = …

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 …

[CODE]M = [[1,2,3], [4,5,6], [7,8,9]] x=0 for i in range(3): x = x + M[i][i] print x ------- M = [[1,2,3], [4,5,6], [7,8,9]] x=0 for i in range(3): for j in range(3): x = x + M[i][j] print x ---------- M = [[1,2,3], [4,5,6], [7,8,9]] x=0 for i in range(3): …

hey gues i search 'replace' matrix? 123 456 789 i need in output 147 258 369

Hi, I' am required to convert a MATLAB function into C++, and this requires me to find determinate of a matrix. I was told that use of BOOST library would make my job easier. I went through the documentation of BOOST Library, but couldn't find much info about the same. …

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 …

peace up on u everyone.. i wanna make a program in c++ include to make more than one matrix and i can make all calculations like + * - / on them like multiply 2 matrices ........... and i can save the matrix in program and i can Retrieves it …

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 …

Hi, I have been introduced to this problem but can't get my head around how the problem works. What I understand is you have a matrix or grid of true and false statements then you need to pair together true and false statements according to best fit. For example a …

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 …

Hi, New to this forum, but been browsing a few threads and seems like the best place to seek help. I have an assignment to complete. What I need to do is read in values from a .txt file and place these values into a matrix. I have the values …

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 …

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 …

I have downloaded a library from this site that deals with Matrix and Complex........Does it do this correctly??? [URL="http://www.zenautics.com/matrixdoc/index.html"]http://www.zenautics.com/matrixdoc/index.html[/URL] if so I want to use this library to get the inverse matrix of of a matrix consists of a complex elements how can I do this??? If it is a …

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 am tring to get this program together and can't seem to make it work. Ok. . this program is to take in a file with a matrix of zeros and numbers 1-9. The zeros are shaded and the numbers are part of a block. All numbers and the ones …

I'm using [code=php] for (int i = 0; i<mdim_; i++) { for (int j = 0; j<ndim_; j++) { data_[j * ndim_ + i]; } } [/code] to change the matrix 1 3 2 4 stored in data, into row order. If I print data_[j * ndim_ + i]; to …

I have: [CODE]void hughint::operator *=(hughint y) { int i,t1,t2,prod,remainder; int carry=0; for(i=num.length()-1;i>=0;i--) { t1=(int)get(i)-(int)('0'); cout<<"t1: "<<t1<<endl; t2=(int)y.get(i)-(int)('0'); cout<<"t2: "<<t2<<endl; if(carry>0) { prod=(t1*t2)+carry; remainder%=10; carry=remainder/10; } } }[/CODE] I'm using 123*100 and the answer I keep getting is 123. Help please.

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 matrix A stored in column major order as 1 3 2 4 and I'm using this function to output it in row major order, i.e. 1 2 3 4 which is does correctly. However I'm confused about how it does this, as I thought the loops would …

I've been struggling over this for hours, and just can't seem to figure out a formula for it. I'm trying to append below, (attach underneath) one matrix to the other. So for example, for Matrix A: 1 2 3 4 5 6 and Matrix B: 7 8 9 A.Append(B) becomes: …

My program keeps crashing and I can't see why...pretty sure its something to do with creating matrix B since when I remove the commands to create matrix B it runs ok. Can anyone see what is wrong? Thanks in advance! I have the header file: [code=php] // matrixlib.h - A …

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++) { …