C++ :: Passing Matrices Into Classes?

Sep 15, 2013

I am currently trying to pass a matrix (multidimensional array) from my main into a function in a class. As usual, you have to include all array sizes, except the first. Unfortunately, the size saved under a variable. When I write it in the square brackets, it doesn't work.

Example:

//main
int main () {
int n = 5;
random object;
object.declare_variable(n);
int array [3][n];
object.pass_matrix(array);

[code].....

I also tried, putting the variable 'var' in the public section above the void and declaring it as static, but still there are error messages; fewer, in my case:

...not an integer constant

So what should I do? Id like to repeat that the int n will vary, which is why I can't just directly write down the size.

View 9 Replies


ADVERTISEMENT

C++ :: Passing Classes As Parameters?

Oct 14, 2013

how would I pass this parameter and how/why is it not working this way? I've tried many different methods to this and I can't quite seem to figure it out.

studentList student;
student.push(252875, "Jerry", "UTPA");

What I thought would work

class student {
public:
int id; //student ID number
string name; //student’s name
string university; //student’ university
};
//student list is a doubly linked list of students.

[code]....

My header file.

I am honestly not sure where to start here. I would assume that it would know what to do with the varibles but it doesn't seem to want to accept them. It gives me

Error1error C2660: 'studentList::push' : function does not take 3 arguments

2IntelliSense: no suitable constructor exists to convert from "int" to "student"

View 11 Replies View Related

C++ :: Passing Classes By Reference?

Mar 1, 2013

I make a class (it stands for an ARMA time series), and I have a method wich modifies some of its variables. In other part of my program I have a function wich receives one object of this class as a parameter and, at some point, it calls the method of the ARMA class to modify it; here is my deal I want to pass the ARMA class by reference to this function, because I want the variables of the instance I'm passing to be modified, not those of a copy the method uses. Also, I would like not to declare the function inside the class ARMA, cause I use it in other places too (it's basically a Nelder-Mead optimization what it performs).

Here is a code wich sketches what I've been trying, and exactly the error message I get is "modifyParameter has not been declared".

#include <iostream>
#include <cstdlib>
using namespace std;
class ARMA{

[code]....

View 5 Replies View Related

C++ :: How To Prevent Someone Passing Classes To Function Template

Sep 13, 2013

Let say i have a following scenario:

a function like this.

Code:
template <typename T1>
print (T1 x){
cout << x << "
";
}

How do I prevent user passing a class or a structure or aanoter function to my function print. I mean i know if a wrong thing is passed that i'll get an error eventually but is there a way to explicitly check what has been passed. How is this done usually ?

View 6 Replies View Related

C++ :: Array Of Classes With Classes Inside

Oct 5, 2013

I have an array of (Student)classes created in Manager.h, which contains a new instance of class Name (name),(in Student.h)How would I go about accessing the SetFirstName method in Name.cpp if I was in a class Manager.cpp? I have tried using Students[i].name.SetFirstName("name");

// In Manager.h
#include"Student.h"
class Manager
{

[Code]....

View 2 Replies View Related

C :: How To Add Two Matrices Together

Mar 6, 2013

How do you add two matrices together ?

View 2 Replies View Related

C/C++ :: How To Multiply Two Matrices Together

Mar 7, 2014

I haven't found anything that small for Matrix multiplication i was just going to ask about how i would multiply to matrices together in c++ as easy as possible, so for example say a i have the following

[2 0 1 0 * [3 0
6 -1 0 2] 0 3
1 2
3 1]

How would i multiply these together. Here is the example

Attached image(s)

View 11 Replies View Related

C :: Cofactor Routine For N X N Matrices

Jul 26, 2013

I tried writing a cofactoring routine for n x n matrices and my code works but it shouldn't. Like, at all. But it does. Idk how and it's consistent.

Basically, my error is when assigning the sub-matrix for the cofactorization method I'm using from here :

Mathwords: Cofactor Matrix

My assignment routine should not work for the sub-matrix because of how I address the rows. under is always 0 and yet it'll assign values to the proper row. Idk how, it's magic.

Code:
#include <stdio.h>
#include <stdlib.h>
long double det(long double **x, int rank) {
/* Determinant calculator routine */
/* We initialize the resulting determinant to zero */

[Code] .....

View 11 Replies View Related

C :: Printing Matrices Without Arrays

Nov 13, 2013

Any example code for printing a square matrix without arrays?

View 7 Replies View Related

C++ :: Adding Two Matrices Using Function

Apr 17, 2014

The program below should add two matrices using function. I have problem in the third function (the summing function). It's saying that something wrong with the array! I'm new to arrays and functions.

#include<iostream>
#include<fstream>
#include<conio.h>
using namespace std;
int matrix1 ();
int matrix1 ();
int add ();

[Code] ....

View 2 Replies View Related

C++ :: Operator Overloading For Matrices?

Sep 16, 2014

I want to implement operator overloading for +=, so that the following arethmetic is possible for matrices: matrix += matrix

Here is how I have defined it in matrix.h

#ifndef MATRIX_H
#define MATRIX_H
#include <cassert>
#include <iostream>
#include <iomanip>
using namespace std;
template <class T> class Matrix;
template <class T> Matrix<T> operator+= (const Matrix<T>& m1, const Matrix<T>& m2);

[code].....

How do I implement this correctly?

View 7 Replies View Related

C++ :: Multiplying Matrices And Arrays

May 14, 2012

Two different matrices will be read from text files (input1.txt, input2.txt) and they will be stored in two dimensional arrays (matrix1, matrix2) and one dimensional arrays (array1, array2). Our aim is to obtain the matrix multiplication using two dimensional and one dimensional arrays.

You are asked to write the main and the following functions. The definitions of the functions are given in the skeleton code.

int read_file(ifstream& in_file, int &row, int &col, double *array, double **matrix)
int write_file(ofstream& out_file, int row, int col, double **matrix)
void print_matrix(double **matrix, int row, int col)
void print_array(double *array, int row, int col)
void multip(double **matrix1, double **matrix2, double **result, int k, int m, int n)
void multip_array(double *array1, double *array2, double *array_result, int k, int m, int n)

You are going to obtain the input and output files as command line arguments

input1.txt :
3 4
2 3 4 5
1 3 5 4
0 4 4 7

The first element in the first line represents the number of rows (3) and the second element represents the number of columns (4) of the matrix (the result file will have the same format).

likewise;

input2.txt :
4 5
1 2 3 4 5
2 9 43 44 21
32 32 32 43 54
1 3 3 4 5

thats my homework and here is the code i wrote from the sceleton code they gave me :

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int read_file(ifstream& in_file, int &row, int &col,/* double *array,*/ double **matrix)

[Code] ....

I didn't understand the array part but even when i exclude the array part i get the program has stopped working message. My os is windows7 ultimate with mingw installed and i compile the program using g++ command in cmd with the arguments input.txt input2.txt resultt.txt

View 1 Replies View Related

C :: Program On Multiplication Of Matrices Using Functions

Feb 26, 2013

when i am running this program no errors are being shown but as soon as i press ctr+f9 to run the program my tc++ window closes.....

Code:
#include<stdio.h>
#include<conio.h>
void multiply(int m1[50][50],int ,int,int m2[50][50],int ,int );
void main() {
int i,j,m,n,p,q,m1[50][50],m2[50][50];

[Code] ....

View 4 Replies View Related

C :: Saving Matrices With Data Structures?

Dec 4, 2014

I'm taking a programming class and currently we're doing data structures. Today, we discussed how to save square matrices column-wise with data structures. The teacher said that after the first few steps where you declare the structure, allocate the matrix, free it and get the dimension (which mostly make sense to me I think), you have to "get" and "set" the matrix by putting in something like

Code:
void setMatrixEntry(Matrix* A, int i, int j, double Aij) {
A->entries[i+j*A->m] = Aij;
}

[Code]....

View 7 Replies View Related

C++ :: Reading Matrices From Text File

Jan 2, 2014

I would like to program a simple finite element solver in c++ (I'm a relatively new programmer by the way). This is the issue, I have a text file with all the information of the model arranged in matrices; an input file would look something like this:

*nodes
1 0 0 0
2 10 15 0
3 17 2 0
4 -4 -1 0

*elements
1 1 2
2 2 3
3 3 4

*material
1 2.0e5 0.30 7.85e-9
2 7.0e4 0.21 2.11e-9

*loads
1 0 0 0
4 0 0 0

So, i want to read this text file and get each of the "*" matrices in its own array. The size of the matrices is not know.

View 1 Replies View Related

C++ :: How To Create N Matrices Of Dimension (n,k) Simultaneously

Feb 27, 2014

I would like to create N matrices of dimension (n,k) simultaneously. Lets say for example that N=3. I read the command a[n][k][N] but I don't understand how to use it.

I know that for some of you this question is silly but I' m new to this language and I have noone else to ask.

View 1 Replies View Related

C++ :: Compiler Generated Identity Matrices

Jan 7, 2014

Identity matrices are in the following pattern:

template<typename T, uint32_t X, uint32_t Y>
class Matrix;
template<typename T, uint32_t X, uint32_t Y>
constexpr Matrix<T, X, Y> genIdentityMatrix() {

[Code] .....

Just make believe that there isn't a problem with the order of declarations / visibility in the above code.

View 12 Replies View Related

C++ :: How To Create N Matrices Of Dimension Simultaneously

Feb 27, 2014

I would like to create N matrices of dimension (n,k) simultaneously. Lets say for example that N=3.

I read the command a[n][k][N] but I don't understand how to use it.

View 3 Replies View Related

C++ :: Program That Adds Matrices And Edits The Result

Jun 24, 2013

The program adds 2 matrices that are 3x3 using arrays and then stores them into another matrix (array) and then it's edited to show a diagonal line of "0" through it, btw I'm pretty new to programming....

insert
Code:
#include <iostream>
using namespace std;
int main() {
int x[3][3],y[3][3],c[3][3],i,j;
cout<<"Enter your numbers"<<endl;

[Code] .....

It works almost just fine lol, Except that the first portion of the diagonal line does not become zero and instead displays the normal addition result.....

View 5 Replies View Related

C++ :: Program To Complete Mathematical Operations Using Matrices

Jul 10, 2014

I've been assigned to build a program which completes mathematical operations using matrices. I have to use dynamically allocated 2d arrays, and can only use * to dereference and not []. I have this code so far, but the multiply_matrix function does not work with most values. I've looked at other similar posts, which have a similar algorithm to mine, but mine does not work for some reason.

/*
*(*matrix(matrix+i)+j)
*/

#include <iostream>
//for sleep() which allows user to see messages before screen is cleared
#include <unistd.h>
using namespace std;

[Code] .....

View 1 Replies View Related

C :: Calculate Product Of Two Matrices - Segmentation Fault In Program

Oct 29, 2014

New to C Programming, I have a problem with a little program I made that calculates the product of two matrices.

And here is the error I get:

View 4 Replies View Related

C :: Unable To Input Correct Form For Matrices Multiplication

Jan 8, 2015

I am unable to input the correct form for matrices multiplication. I have an exam tomorrow in which I need to use this.

Code:

#include <stdio.h>
#include <conio.h>
int main() {
float a[10][10], b[10][10], c[10][10];
int i, j, k, l, n=0, m=0, x=0, y=0, sum=0;
printf("Enter the number of rows and collumns of the first matrix");
scanf("%d %d", &n, &m);

[Code]...

View 7 Replies View Related

C :: Testing Array Functions - Return Sum And Difference Of Two Matrices

Nov 10, 2013

I have these arrays in a driver to use for testing:

insert Code:

#include <stdlib.h>
#include <stdio.h>
#include "TwoD.h"
int main() {
/* Initialization of LCV's */

[Code] ....

If I want to test these functions in this header:

insert Code:

#ifndef TWOD_H_INCLUDED
#define TWOD_H_INCLUDED
#define MAX_SIZE 50
/* Structure defenition for TwoD */
typedef struct

[Code] ....

I am trying to perform columnSum and rowSum, as well as twoDadd and twoDSubtract using the arrays defined in my driver. How would I do that using A and B in my driver?

View 8 Replies View Related

C :: Input Matrices Dimensions - Calculate Elements Of Products

Nov 14, 2013

This is my code and it's not giving me the right output

Code:
#include <stdio.h>
int main() {
int dim;
int i, row, col;
// inputting matrices dimensions
int M0, M1, M2;

[Code] ....

The output should give me this:
Input 2
Correct Output 2 5 4 10

View 10 Replies View Related

C :: Number Of Utility Functions For Two Dimensional Arrays Of Integers Or Matrices

Nov 7, 2014

I am working on a number of utility functions for two dimensional arrays of integers, or matrices. However I am having a problem with segmentation faults, most likely due to errors in using malloc in functions like copyMatrix.

Code:
matrix_utils.h~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//This function checks if two matrices are equal
int isEqual(int **A, int **B, int n);

//This function returns one row of a matrix
int * getRow(int **A, int i, int n);

//This function returns one column of a matrix
int * getCol(int **A, int j, int n);

[Code] ....

View 2 Replies View Related

Visual C++ :: Linear Program For Matrices - System Cannot Find Path Specified

Dec 8, 2012

I have two pieces of code:

Code:
#include <cmath>;
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <iomanip>

[Code] ....

I am using the gnu glpk library to calculate a linear program for my matrices. Why I get the error message exit code 3 which apparently means "The system cannot find the path specified"?

View 12 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved