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.
View 10 RepliesI'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?
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)
I have an adjacent and opposite. I think I can use: tan(x) = opposite / adjacent but how do I get the tangent inverse?
View 10 Replies View RelatedI 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] .....
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.
like other programmers I am also new to the world of programming. So, I have to use a mathematical function in Cmath.
The function is z1 = Sin2α + sin5α - Sin3α / cosα+1-2sin*2(2α)
z2= √x*3 + 3 / x*3 - 3
My results so far...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
[Code].....
I've just started coding a "Mathematics" library for my own, just to practice some OOP concepts, but sadly I didn't get too far with it before the first errors appeared. That is, I created a Matrix.H and Matrix.CPP file (separate class) in a "Linear Algebra" folder.
However, when I run the code I get the following (linker?) error:
#include <iostream>
#include "Matrix.h"
using namespace std;
int main() {
Matrix<int> A(7,5);
int row[] = {5, 10, 9, 11, -5};
[Code] ....
I am using Visual Studio 2012 (stating this in case it could be related to the reason for which I get the error).
I'm working on a class project, and I'm having a difficulty. Suppose I have: string a = "21" and string b = "30"; normally, a+b=2130 (i.e concatenation of the characters in the string) but suppose I want a+b=51 (i.e. numerical addition) how do I go about this?
View 1 Replies View RelatedI'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] .....
I want to add mathematical expression in a binary tree but I have some problems with the algorithm. I found this one:
-If the current token is a '(', add a new node as the left child of the current node, and descend to the left child.
-If the current token is in the list ['+','-','/','*'], set the root value of the current node to the operator represented by the current token. Add a new node as the right child of the current node and descend to the right child.
-If the current token is a number, set the root value of the current node to the number and return to the parent.
-If the current token is a ')', go to the parent of the current node.
Here is the code that I made so far:
template<class T>
void Tree<T>::Expr(Node<T> *node, char expr[], int &i) {
i++;
T x = expr[i];
if(x == '(') {
node = node->Left;
[Code] ....
I know that it is a big mess and it doesn't follow the algorithm but this is the problem. For example if the token is '(' I go to the left child of the current node. Then lets say that the next token in the expression is a number. I add this number to the current node and I must go back. But how can I go back to the parent? I will go back to line 13 and the program will end. What should be the structure that I must use?
I wrote a program that tries to tokenize a mathematical expression, inserting the tokens in a list of strings. The list is as follows:
typedef struct listOfStrings {
char **array;
int size;
} ListOfStrings;
There is even a function to initialize the listOfStrings. The thing is: I'm printing a token every time it is complete and every time it is inserted in the list. The output is okay. However, when all tokens are processed and I call function print_list_of_strings to print the tokens again, the first token is printed with a leading garbage value if the input for the program is "3 + 4 * 2 / ( 1 - 5 ) ^ 2 ^ 3". How is this possible? The code for printing the list is as follows:
void print_list_of_strings( const ListOfStrings *const lPtr ) {
int i;
int numberOfElements = lPtr->size;
if ( numberOfElements != 0 ) {
for ( i = 0 ; i < numberOfElements ; ++i ) {
[Code] ....
The list just prints --- if it's empty, although this isn't the case for the program I'm writing. Also, if the input is "1 + 2", everything goes fine. The code for inserting at the list is:
int insert_at_end_of_list_of_strings( ListOfStrings *lPtr, const char *const str ){
int lengthOfStr = strlen( str );
int numberOfElements = lPtr->size;
if ( ( ( *( lPtr->array + numberOfElements ) ) = ( char * )malloc( ( lengthOfStr + 1 ) *
[Code] ....
How do I print a mathematical series such as
1 + 2/2! - 3/3! + ...... n/n! //n is read from user
Not only we need to print the series on the screen but at the same time find the sum using simple loops.
I want to program an advanced calculator. I'd like to enter some more complex expressions like -17+3*4*(4-sqrt(4) and i want, that mathematical operations are done the correct order, so at first 4-sqrt(4) is calculated, then 3*4*2 and then -17 is subtracted.
Problem 1: Convert a string into a mathematical calculation
Problem 2: Calculate in the correct order
How would I do that (I dont expect perfecly precoded calculators from you, just the way how to do it)
Google search just delivers primitive calculations with entry methods like
Enter first number 1
Enter operator +
Enter second number 2
3
But thats not what i want
The point of my code is to evaluate a mathematical expression that's already formed in a Binary Search Tree. : ((6+5)-3)*(2/1)=?
I've read other forums and they usually use cout, cin and << >> but I'm still in the learning process so this is basically primitive coding.
Anyway, The recursion is already correct (I think). My problem is how to return char* or should I say an element which has 2 or more digits.
typedef struct cell{
char elem[max];
struct cell *left;
struct cell *right;
}celltype, *node;
node A;
char* evaluate(node *A) //passed as evaluation(&A);
[Code] ....
And the reason that I'm using char is because the operators are also elements in different nodes.
The code above is actually the result when I remembered that you can't return 2-digit char.
The code below is before I remembered that. It works when all results are 1 digit numbers.
typedef struct cell{
char elem;
struct cell *left;
struct cell *right;
}celltype, *node;
node A;
[Code] ....
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] ....
changing a 9 digit integer into a new 9 digit integer through simple mathematical operations. For example, I need to change 123456789 into the new digit 456123789. Sometimes I need to change a 9 digit integer into an 8 digit integer. An example is 789062456 into 62789456. I can ONLY use simple mathematical operations (addition, subtraction, multiplication, division and modulo).
View 4 Replies View RelatedI got this program to create an array of playing cards and assign the values and suits and shuffle the array. I'm at the point where I need to output the cards but I need to burn the first card by making it output "**" instead of the card. my cards[] is a constant so I can's assign the first card as such.
void showCards(const int cards[], int numCards, bool hideFirstCard) {
if (cards[0]) {
hideFirstCard=true;
cards[0] = '**';
} for(int a = 0; a <= numCards; a++) {
cout >> showCard(cards[a]);
} }
Write a program using user-defined function which accepts an integer array and its size as arguments and assign the elements into a two dimensional array of integers in the following format: If the array is 1,2,3,4,5,6, the resultant 2D array is
1 2 3 4 5 6
1 2 3 4 5 0
1 2 3 4 0 0
1 2 3 0 0 0
1 2 0 0 0 0
1 0 0 0 0 0
Write a function that takes an array and returns true if all the elements in the array are positive, otherwise, it returns false.
View 6 Replies View RelatedThe program should store a character array in reverse order then display the reversed array. I have also included in the code that will display the actual characters into the array as it loops through. So I know the characters are being stored, but why doesn't it display the entire string when I call it?
Code:
#include<stdio.h>
int main(){
char str[50];
char rev[50];
printf("Enter Desired Text: ");
scanf ("%[^
[Code] ....
Is it just my compiler?
I wrote this simplified version of a program i am writing that parses data in UDP packets. In the process of doing so i pretty much answered all my questions and fix all the problems i was having.
decodeSystemMap function will be in loop, and will proccess packets that have mostly the same data, only a few items will be added or changed or deleted.
whats the best way to check if there are any new, deleted, or removed items in the packet and only modify those?
Is there anything unsafe / dangrous about the way the code is now?
Code:
/* * File: main.c
* Author: david
*
* Created on May 23, 2013, 11:57 AM
*/
#include <stdio.h>
#include <stdlib.h>
[Code] ....
im trying to read in 1 array and get 2 as outputs from 3 different functions.my read array is easy enough were im getting confused is how to read that array, separate it and take out only the parts i want and place them into a 2nd, then again a 3rd array.i have the following so far:
Code:
#include<stdlib.h>#include<stdio.h>
#include<unistd.h>
#define SIZE 10
}
[code]....
this compiles without a complaint, but when i go to run it no longer responds after taking the 10th element (well 9th if counting from 0).I think i have the if correct for the even odd section, but when i try to populate B or C array with the output of that if statement from A is were i think things are dying...
#include <iostream>
#include<fstream>
int decryption(int);
int multiply(int,int[][2]);
using namespace std;
main(){
int n;
ifstream inFile;
inFile.open ("out.txt");
[Code] .....
I was trying to store numbers read from a text file into 2D array but I am getting the error above.here is where the error occurs:
line 33: cout<<m[i][j]<<" ";
Assume you want to use a loop to process an array of characters starting from the beginning of the array. You want the loop to stop when you read the null terminator character from the array. Fill in the loop test condition that will make this work correctly.
index = 0;
ch = array[index];
while ( _____________________________)
{
// process the character
index++;
ch = array[index];
}
I know to read a strings into array and tables.. what is they are mixed up?? strings are just names ( 3 characters) and there are bunch of table.. the max size was set to 60
ex. text file
JES
DAN
JEN
.
.
.
01010101
10010101
RAM
JET
01010010
10100101
.... and so on
should i use a while loop?