C++ :: 4x4 Matrix Inverse Implementation
Sep 19, 2013
I'm implementing a 4x4 matrix class and all is going well until the inverse function turned up. I'm trying to implement the inverse function, but I can't seem to get my head around it.
I've tried the internet, but found nothing useful. Also, I've looked into source code of other programs/libraries that implement a matrix class, but the code is unreadable.
How I can implement this damn 4x4 inverse function? I know the process of inversion, but putting that process into code is proving quite a challenge.
In addition, I do have some code, but it's unmanageable and inefficient at the moment. If you want to see it, just ask.
Additional question(s): What applications does the inverse matrix have in 3-D?
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Apr 3, 2014
I write this code for Inverse of matrix in C language . But there is error in determinant function that say "can not convert 'float' to 'float(*)[20]' for argument '1' to 'float determinant(float(*)[20])' " ....
/* a program to calculate inverse of matrix (n*n)*/
//actually one of the way to calculate inverse of matrix is : A^(-1) = 1/|A| * C(t)
that A is matrix and c(t) is taranahade A
#include <stdio.h>;
#include <conio.h>;
#include <string.h>;
#include <stdlib.h>;
const int max=20;
int i , j , n , k , size=0 , row , column ;
float num , det=0 , inverse_matrix[max][max] , matrix[max][max] , new_mat[max][max] , m_minor[max][max] , m_Transpose[max][max];
[Code] .....
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Feb 6, 2015
How do you calculate the inverse view matrix?
Is that really just the inverse of the view/camera matrix?
Or is that something else?
I have seen articles online on the overall mathematical theory behind it but I am using the GLM math library and it has this nifty glm::inverse() function.
I was just curious if I can do a glm::inverse(ViewMatrix) and that would be correct.
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Dec 6, 2013
I need to find inverse of a matrix data in binary file should be used to form matrix.its not finding inverse correctly rest is working good.
Code:
#include <stdio.h>
void createbin();
void display();
void inverse();
int main()
{
createbin();
display();
inverse();
[Code] ....
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Nov 29, 2014
I had the following question in my exam paper and only got 2.5 out of a possible 7 marks.
Given the Matrix class:
class Matrix {
public:
Matrix(unsigned r, unsigned c);
Matrix(const Matrix<T>& rhs);
~Matrix();
const Matrix<T>&operator=(const Matrix<T>& rhs);
[code]....
Use the linkedStackType class (Linked list implementation of stack) and write a function reverseRows to reverse the order of rows in the matrix. Note that reverseRows is not a member function of the Matrix class therefore only the public interface of matrix can be used.
template<class Type>
struct nodeType {
Type info;
nodeType<Type> *link;
[code]....
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Dec 1, 2014
I had the following question in my exam paper and only got 1.5 out of a possible 6 marks. This is the question:
Given the Matrix class:
class Matrix {
public:
Matrix(unsigned r, unsigned c);
Matrix(const Matrix<T>& rhs);
~Matrix();
const Matrix<T>&operator=(const Matrix<T>& rhs);
[Code] ....
Use the linkedStackType class (Array implementation of stack) and write a function reverseCols to reverse the order of columns in the matrix. Note that reverseCols is not a member function of the Matrix class therefore only the public interface of matrix can be used.
//Implementation of Stacks as Array
template<class Type>
class stackType: public stackADT<Type> {
public:
const stackType<Type>& operator=(const stackType<Type>&);
[Code] ....
What is the correct solution must be to reverse the columns of the matrix?
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Feb 17, 2014
I need to take an array, and get the inverse of it (basically, just how you would take an inverse of a function in math). I need to do it where, if a[i] = x, b[x] = i. I would just copy from array a to array b in a function.
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Dec 25, 2014
Print the inverse number. Ex: 2178*4=8712
Write down a program which can satisfy the prerequisite and print out the screen.
The answer is:
Code:
void inverse2 ()
{
int i,j;
for (i=1000;i<=9999;i++)
for (j=1;j<=9;j++)
if (i*j==inverse (i))
printf("%5d%2d",i,j);
}
I can't understand the double for loop.
for (i=1000;i<=9999;i++)
for (j=1;j<=9;j++)
And The meaning for
i*j==inverse (i)
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Aug 12, 2013
I have an adjacent and opposite. I think I can use: tan(x) = opposite / adjacent but how do I get the tangent inverse?
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Mar 27, 2013
i want to know how i can solve this question? do i need to create a class or write the program codes.
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Jun 1, 2014
I just want to know the code of the program: Write code to accept matrix as aurgument and display its multiplication matrix which return its multiplication matrix.
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Feb 27, 2012
I want to assign a matrix to submatrix of a bigger matrix.
ublas::matrix<int> A(8,5);
ublas::matrix<int> B(2,5);
for(size_t i=0;i<A.size1();++i)
for(size_t j=0;j<A.size2();++j)
A(i,j)=i*A.size2()+j+1;
for(size_t i=0;i<B.size1();++i)
for(size_t j=0;j<B.size2();++j)
B(i,j)=i*B.size2()+j+5;
ublas::matrix_range<ublas::matrix<int> > a(A,ublas::range(0,2),ublas::range(0,5));
a=B;
and it works.
but if the matrix is compressed_matrix type, there's something with it. the error log as below:
Check failed in file boost_1_48_0/boost/numeric/ublas/detail/matrix_assign.hpp at line 1078:
detail::expression_type_check (m, cm)
terminate called after throwing an instance of 'boost::numeric::ublas::external_logic'
what(): external logic
Aborted
I'm not sure this is a bug or not.
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May 25, 2014
I have to prepare a project. But I don t know how can I do this. Program will find a matrix P for a square matrix A such that P^-1 A P ....
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Oct 4, 2014
3 3
2 1 3 2 3
1 0 2
1 2 6
First line shows row and column number
First index of the second line tells the number of non-zero entries of the first row and second index tell the column number where the non zero entry is placed
for 1st row of matrix:
non-zero entries=2
column number=1
non-zero entry=3
column number=2
non-zero entry=2
covert this in the given form
0 3 3
2 0 0
0 0 6
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Aug 18, 2013
I have to develop minimalistic implementation of RSA algorithm in C for an embedded device.
I'm doing that for two days but I have run into a problem. The N modulus is the limitation for the maximum message value to be encrypted with RSA.
For example theoretically RSA-1024 can encrypt/decrypt messages 1024 bits long but I still cannot understand how to choose p and q values to produce N == pow(2, 1024).
Is it possible to encrypt/decrypt 1024 bits long messages in practice if the N < pow(2, 1024)?
So far I'm getting the following results
Code:
Encrypting with RSA
d=15689981, e=21, n=16484947
In=16484942, Encrypted= 6074492, Out=16484942 (OK)
In=16484943, Encrypted= 5468920, Out=16484943 (OK)
[Code] ....
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Aug 8, 2013
I was trying to implement Big Integer Implementation. I wanted to start with the basic operation of addition. I am having some problems with operator overloading part
/**
BigInteger implementation
*/
#include "conio.h"
#include "iostream"
[Code]....
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Apr 19, 2014
I was looking at this tutorial: [URL] ..... And I was wondering if implementing it in MVC would be pretty much the same way? How would I display feed items in the views page using?
I tried something like:
ReaderModel Reader = new ReaderModel();
Collection<Rss.Item> List;
List = Reader.GetFeed();
ViewData["RssItems"] = List;
// then in index.cshtml
@foreach(Collection<Rss.Item> items in ViewData["RssItems"]) {
<h3>items.Title</h3>
...
}
I don't think this is right as I'm getting those red error lines...
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Aug 5, 2013
Here is the code,
Code:
class A {
private:
void* operator new(size_t size);
};
int main() {
return 0;
}
The code above compiles fine without errors. But operator new might not have implementation body?
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Jul 9, 2013
I've been working on creating a simulator to crash two galaxies together as part of a project to stress test a CUDA super computer. I've got a long way to go and am currently just working on correctly simulating n-body gravity functions. First I will use this to simulate the cores of the galaxies (the black holes) and eventually the stars.
So long story short I'm working on the beginnings of a gravity simulator. At this point I found some basic code that works well but doesn't quite give the effect I'm looking for.
The code below only pulls each object towards each other like a spring faster and faster until they shoot off into infinity. I try to give one of my bodies an initial velocity to get it to orbit another, but it always just shoots straight at the other body. I'm thinking I need to factor in inertia so that the initial velocity doesn't just get calculated away really fast by the other calculations.
I'm really looking for a bit of direction to get a real gravity simulator with orbits and such working right so eventually I can scale it up to a galaxy, throw in 100B stars and let the CUDA run for a month..
Code:
void update_galaxies(GLdouble elapsedTime) {
//Calculate gravity simulations
GLdouble r1, r2, r3;
r1 = r2 = r3 = 0.0;
for(unsigned int i = 0; i < galaxies.size(); i++)
[Code] ....
As you can see, I'm calculating all the bodies in a vector called "galaxies" with each other, and doing a basic gravity calculation to it. The update_position function simply takes the calculated acceleration and uses it to calculate the velocity and position based on the "elapsedTime".
I think I need to use the Varlet or Runge-Kutta integration methods, after doing a bit more research.
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Mar 12, 2013
I'm having problems with implementing depth first search.
Code:
6 10 //6vertices 10edges
0 2 //vertex and its adjacent vertex
1 0
1 2
2 3
2 4
3 1
4 1
4 3
4 5
5 3
Output to terminal: 0 2 3 1 4 5
but it should be: 0 2 4 5 3 1
Here's my code:
#include<stdio.h>
#include<assert.h>
/* maxVertices represents maximum number of vertices that can be present in the graph. */
#define maxVertices 100
void Dfs(int graph[][maxVertices], int *size, int presentVertex,int *visited)
[Code] ....
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May 31, 2014
Code:
#include <stdio.h>#include <unistd.h>
#include <stdlib.h>
#define STACKSIZE 100
struct stackk
{
int top;
int items[STACKSIZE];
};
typedef struct stackk *s;
[Code]...
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Apr 7, 2014
I am trying to implement a stack class which has struct data type as its private member. I am getiing the following error ,
bash-3.2$ g++ stack_str_arr.cpp
stack_str_arr.cpp: In member function ‘void stack::push(int)’:
stack_str_arr.cpp:39: error: ‘top’ was not declared in this scope
stack_str_arr.cpp: At global scope:
stack_str_arr.cpp:43: error: no ‘void stack::display()’ member function declared in class ‘stack’
Code:
#include<iostream>
using namespace std;
#define MAX 5
class stack {
public :
stack();
[Code] ....
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Nov 22, 2014
I'd like te have a heap which contains any item inserted by me. However, when I insert the values, if I delete the min value of this coded heap twice, I get the min value uncorrect.I could not find where the mistake is.
Code:
void BinaryHeap::percolateDown(int hole) {
int child = hole*2;
while (child < size) {
[Code].....
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Sep 12, 2014
I am trying to implement some kind of named class. It would look something like this:
class MyClass {
virtual std::string getName() = 0;
};
And now (what doesn't pass the compilation)
template <std::string NAME> class MyNamedClass {
std::string getName() { return NAME;}
};
And so every time I would like to have a class with a name, I could just do the following:
FinalClass : public MyNamedClass<"FinalClass">{};
The idea is not to have to always reimplement getName(), and just do it concisely in the declaration.
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Aug 26, 2013
I was trying to implement a hash function in c++. This is just for learning purposes and not for a class project or assignment question. I had some questions before I started programming it:
1) Is it meaningful to have a hash function which maps string to string, string to int, int to int, float to int?
2) Can we have a template implementation which does element to element hashing?
I looked at several sources for a clear understanding of concepts and implementation technique but could not find a good source for reading about hashing.
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May 11, 2013
I am currently trying to implement a pathfinding algorithm using c++ and opengl. My code so far is shown below:
#define OPEN 1
#define CLOSED 2
#define UNVISITED 3
#define BLOCKED 4
#define HIGHLIGHT 5
#define ONROUTE 6
#define GOAL 7
#define GSIZE 20 // size of tile grid
#define ISTART 15 // index position of starting tile in grid
[Code] ....
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