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?
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];
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.
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;
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?
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.
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.
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
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
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)?
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
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...
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..
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.
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)
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();
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) {
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.
