C++ :: find Index From 2 Vectors Combined
Feb 9, 2013
I am new in c++ and I am having difficulties with finding values in two vectors. Basically, I have two constant integer vectors u and v . They have the same length. I would like to select all the values in u and v, that respect those statements:
u>= x1 & u<= x2 & v>= x3 & v<= x4
x1, x2, x3, x4 are predefined integers.
Below is the code i use to do that in Matlab:
idx = find(u>=x1 & u<=x2 & v>=x3 & v<=x4);
A=u(idx);
B=v(idx);
But how to translate that in c++.
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Feb 12, 2014
I have problem with find the index of the following array.
int minimums[2]={201,201};//first initialize both to greater than maximum allowed
for (int index = 0; index < 200; index++) {
if(find_array[index] < minimums[0]) {
minimums[0] = find_array[index]; //Lowest number
[Code]....
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Mar 18, 2013
im using a for loop to find the index values of the tied high scores and store them into string list then reference list in the second for loop to output it to screen however it isnt letting me use an array with index i as an index its self.
void printHighest(Student s[], int length){
int index;
string list[10];//you're never going to have more than 10 people with a tieing highscore.
index = findMax(s, length);
[Code] ....
For the time being I simply removed the idea of string list and just put the contents of the second for loop into the if statement above it. However, I am still curious as to if I can reference an index of an array in an index of another array.
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Apr 17, 2014
Here is my code to find the index of a string array whose string is equal to the query string. I have checked the program can return the correct index, but the cout result is totally wrong.
#include <iostream>
#include <string>
using namespace std;
[Code].....
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Oct 28, 2014
I've been typed out a C program to let the user define the size of their string , and key in characters for this string , the program would then prompt the user for a character to search for in the string and return it's index value. Eg. Index of c in abc is 2. My code is as shown:
#include<stdio.h>
#define SIZE 20
int search(char x[SIZE+1] , int n , char s);
int main(void){
char x[SIZE+1] , s;
int n , index;
[Code] ....
However , after I key in my characters for the string , the program does not prompt me to input a character to look for, it just prints it out and returns some funny number. But the program works just fine is I move this portion to the top :
printf("Enter alphabet to find: ");
scanf("%c",&s);
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Apr 27, 2013
I have been researching how to use the prefix of a user input file name as the prefix of an output file name for a combined file. "Adding two text files into one text file", but the combined file name is entered directly, not from a variable.
std::ifstream file1( "file1.txt" ) ;
std::ifstream file2( "file2.txt" ) ;
std::ifstream file3( "file3.txt" ) ;
std::ofstream combined_file( "combined_file.txt" ) ;
combined_file << file1.rdbuf() << file2.rdbuf() << file3.rdbuf() ;
My code already has the user input file name as a variable. I would like to insert the prefix of that variable in line 4 with a new suffix.
I also found this code in an archived post by Duoas on May 31, 2010, "Changable filename based on user input," but I don't know how to adapt it to my combined file.
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int main() {
ofstream f;
string filename;
[code].....
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Mar 19, 2014
I create a list of vectors (a vector of n vectors of m elements).
std::vector <std::vector <int> > vsFA (n, std::vector<int>(n));
How I assign values? I try below, but not worked
void armazenaFA( std::vector <int> &vFA) // this function only knows about vFA
{ vsFA[n] [m]= simTime().dbl();
OR
vsFA[n].push_back(simTime().dbl());
}
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Sep 19, 2014
This is probably a very basic question, but I need to create two vectors and then loop through the vectors and output each pair that is found.
The user will input min1 and max1 with step1 for the first vector and min2 and max2 and step2 for the second vector. Then the loops will go through and return the combinations will return each pair of the two vectors.
So if I input min1=1 and max1=10 and step1=1 and same for vector two the return would be:
[1,1]
[1,2]
.
.
.
[10,10]
This is for part of a homework assignment, but I can't continue on the assignment without first getting this simple part to work.
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Mar 9, 2013
The following fuction from a class is supposed to count the number less then the average of all number combined. but it does not do that, now the fun part if you change it to count the number greater then the average it works great.
void IntegerArray::countBelowAverage() {
avrg=calcAverage(avg);
int count=0;
for(int x=0; x<100; x++) {
if (list[x]<avrg)
[Code]...
How do i get this to post in the proper format?
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Apr 17, 2014
I was trying to debug a code which was behaving in an abnormal way
Code:
#define NOOFELEMENTS 32
unsigned char array[NOOFELEMENTS];
unsigned char array1[23];
init() {
for(i=0;i<=32;i++)
{
array[NOOFELEMENTS] = 0
}
}
I could trace the above one of the mistakes where the array initialization is crossing the array limits and writing into array[32] which is not available. My question does it overwrite into array1 as it is declared below array or it can write into any other location.
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Sep 9, 2014
I am trying to get the index of a value by inputting the value:
For example if i have
int arr[5]={22, 85, 58, 78, 69};
indexOfItem(arr, 78);
and have the output be:
the index of the item is: 3
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Dec 16, 2013
If i have current index and row/columns count how do i get on which row and on which column index is individually?
This is what i have tried, but column index is incorrect:
#include <iostream>
int main()
{
int rows = 5;
int colm = 6;
int inx = 12;
int rowInx = inx % rows;
int colInx = inx % colm;
std::cout << "row: " << rowInx << std::endl;
std::cout << "col: " << colInx << std::endl;
return 0;
}
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Jun 27, 2014
Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Chapter7Problem13
[Code] .....
I keep getting an out of bounds error in my code
I'm suppose to enter number of orders then enter those orders then calculate a discount and net price display the orders, discount, net price then the totals at the bottom ....
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Apr 9, 2013
I want to get the starting index of structure elements, whoz id are 0,1,2,3 Like in below code col_data[0] (starting id=0) col_data[3] (starting id=1) col_data[5] (starting id=2) col_data[8] (starting id=3) Code:
Code:
typedef struct gg{
int id;
int value;
}
[code]....
How can i skip remaining loop iterations when it get that index and will go back to loop again for getting next element index?
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Dec 9, 2013
I need function to determine where to place new element in sorted array. I want to use binary search to find index where element should be placed, when push all others.
Prototype should be something like
int WhereToPlaceElement(ElementType hash); // uses private atribute ElType** elements
I have tried my best to write, but all tries ended in inf loops and reading invalid locations of array.
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Sep 6, 2013
How can I use one index to iterate between all the values
for example:
//I defined
vector<typeA> VA(XD,typeA());
vector<typeB> VB(XD,typeB());
//then the standard method to iterate is:
for(vector<typeA>::Size_type i=0; i<VA.size(); i++) {
VA[i].functionA();
VB[i].functionB();
}
the other way, use int,
//I defined
vector<typeA> VA(XD,typeA());
vector<typeB> VB(XD,typeB());
//then the standard method to iterate is:
for(int i=0; i<VA.size(); i++) {
VA[i].functionA();
VB[i].functionB();
}
none of above make me feel formal...
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May 21, 2014
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Mind_Puzzle {
public partial class Form1 : Form
[Code] .....
When i try to start it, it doesn't start or it gives an error on "UsedList[i] = false;".
The error: "An unhandled exception of type 'System.IndexOutOfRangeException' occurred in Mind Puzzle.exe
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Oct 27, 2014
I am suppose to make a value to attach to a array and then have it stop on the last one with an error if it were to go past (done more or less).
Problem is I am suppose to use a int to hold the value of the array and then add 1 each time but my question is, if you were to add another number to increase your current array slot, what would that look like as I image that going array[0] + 1 isn't going to make it array[1].
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Nov 5, 2014
I need understanding the logic behind this function. The function is supposed to "Return a pointer to the character at the index given" . For example, what exactly are we declaring at "(char * const c, int index)"? where does "index" come from or equal to in the body of the function?
Code:
1
2
3
4
5
6
7
8
char * GetValueAtIndex(char * const c, int index)
{
int i = 0;
char *p = c;
while (i++ != index)
p++;
return p;
}
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Nov 22, 2014
Im problem with parsing. I read file line by line and i store another class bu when i parse the line last word gone example "I study algebra and discrite math" math didnt store.Why ? i want to calculate index section for document how can i solve this problem??
Code:
void DocumentIndex::parse(){
size_t pos = 0; //position
pos =line.find(" ");
while( ( pos = line.find(" ") ) != std::string::npos )
{
[code]....
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Jun 17, 2013
I need to sort the elements in a 2d array by their index (starting from 1) for example:
Code:
1 5 3
4 7 8
4 10 2
10 is the biggest element and its index is 32, after 10 comes 8 with index 23 etc etc...
Looking for examples for two orders ... By descending and ascending order...
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Oct 12, 2013
my question is located as a comment beside the last printf ! ? check the comment near the last printf the comment is ==>here i get a sequence of numbers the question is how can i copy this sequence to an array and the print the array out ?
Code:
#include <stdio.h>
#define N 30
#define n 100
[Code]....
here i get a sequence of numbers the question is how can i copy this sequence to an array and the print the array out ?
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Jan 10, 2015
Here's my code
bitIndex = 5;
Code:
bool getBS(PBitSet _this, int bitIndex) {
if(_this->bits & (1 >> bitIndex))
return true;
else
return false;}
I want this code to return the value of the bit at position bitIndex. It can be either false or true. The problem is, that it always returns false, even thought I enter 16 as my number, so the 5th bit should be true.
0000|0000 = 0
0001|0000 = 16
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May 3, 2013
I am storing info in a vector but I want to store certain info at a particular index. I am new to using vectors and am unsure about have to do this. I am aware of the insert method but am confused on how to use it to store at a particular index.
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Apr 9, 2013
Task: - Write a function `index` that converts an int from 0 to 5 into its word. (It should take an int and return a string.)
0 -> "zero"
1 -> "one"
2 -> "two"
3 -> "three"
4 -> "four"
5 -> "five"
anything else -> "other"
#include <iostream>
using namespace std;
string index(int x) {
if(x=0)
return "zero ";
else if(x==1)
[Code] .....
It compiles but doesn't print anything.
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Dec 7, 2014
Design and implement the class myArray that solves the array index out of bound problem, and also allows the user to begin the array index starting at any integer, positive or negative. Every object of type myArray is an array of type int. During execution, when accessing an array component, if the index is out of bounds, the program must terminate with an appropriate error message. Consider the following statements:
myArray<int> list(5); // Line 1
myArray<int> myList(2,13); //Line 2
myArray<int> yourList(-5,9); // Line 3
The statement in Line 1 declares list to be an array of 5 components, the component type is int, and the componentst are : list[0], list[1]…list[4]; the statement in Line 2 declares mylist to be an array of 11 components, the component type is int, and the components are: mylist[2],…mylist[12].
This is what I have so far:
#ifndef H_myArray
#define H_myArray
#include <iostream>
using namespace std;
template <class myArray>
class myArray
{
public:
private:
return 0;
};
#endif
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