C/C++ :: Two Arrays With Different Sizes Into One 2 Dimensional Vector
Mar 24, 2012
I am using 2 ARRAYS OF DIFFERENT SIZES in One 2-Dimensional Vector, and my output is not correct. The arrays are size 4 and size 13.
I want COLUMN 0 to have: 55, 66, 77, 88.
I want COLUMNs 1-12 to have 1,2,3,4,5,6,7,8,9,10,10,10,11 in EACH ROW. It would seem that the 2nd loop for the size 13 array would need to loop 4 times in order to fill 4 rows, however, I'm not sure how to do that. Here is what I have so far in code and output:
#include <iostream>
#include <vector>
using namespace std;
int main() {
int typeArray[4] = {55,66,77,88};
int valArray[13] = {1,2,3,4,5,6,7,8,9,10,10,10,11};
[Code] ....
OUTPUT:
55 0 0 0 0 0 0 0 0 0 0 0 0
1 2 3 4 5 6 7 8 9 10 10 10 11
77 0 0 0 0 0 0 0 0 0 0 0 0
88 0 0 0 0 0 0 0 0 0 0 0 0
How to populate rows correctly?
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Nov 8, 2014
#include <iostream>
#include <cassert>
#include <vector>
using namespace std;
vector<int> flatten(int a[100][200]) {
vector<int> v;
for (int i = 0; i < 100; ++i) {
[Code]...
I made a function for two dimensional arrays with vector, but I don't know how to make the test code for it.
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Mar 20, 2012
Two Hard-coded Arrays into One 2-Dimensional Vector I have 2 arrays, each of them are hard-coded with integer values. I also have one 2-Dimensional vector and I want to put 1 array into the first column of the vector and the other array into the 2nd column of the vector. The reason is that I want to do math on the 2nd column of the vector only.
I am able to accomplish this with 3 arrays. Two of them are 1-Dimensional and the third array is 2-Dimensional.
I know how to pass ONE Array into ONE vector:
Code:
vector<int> myVector(typeArray, typeArray + 4);
however, when I declare a 2-Dimensional vector:
Code:
vector< vector <int> > myVector(3, vector<int> (2,0))
I am not seeing how to add TWO arrays or how to OUTPUT it to the screen.
Here is my code using DevCPP:
#include <iostream>
#include <vector>
#include <Windows.h>
[Code]...
I don't get any errors, however, I don't know how to output it to the screen to see what it looks like.
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Sep 6, 2013
#include <iostream>
#include <array>
#include <sstream>
[Code].....
I need to add thevArr[I] and vArr1[I] and store in vArr2[I] but I cant figure out how to drop the value or replace with a 0 if vArr is bigger than vArr1. IE: 1st number: 123 2nd number: 4567
Ill get something like this:
1 2 3
4 5 6 7
5 7 9 -827349
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Oct 15, 2013
I'm building a box to take in several arrays of different lengths. one group happens every 10 seconds. one of them happens every 5 seconds. this is from a weather station.
10 sec
subgroupA[14]
subgroupB[24]
subgroupC[17]
subgroupD[12]
subgroupE[34]
5 sec
subgroupC[17]
I plan to retransmit them, substantially unchanged at a lesser rate to save radio power over a serial data link. buried in groupD, I want to change a few chars before retransmit.
I don't want to go to the trouble of doing a structure for each of them since most will be resent unchanged. some entries are chars, some are decimal, some are a mix. I guess it might be convenient to further define groupD, maybe not.
what is the best way to declare the group? I want them to be contiguous since that's how they will end up in the tx buffer. Each subgroup has its own checksum, so I planned it this way to make checksum more convenient.
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Feb 15, 2013
I have a paradigm where a integer before gets enqueued to a queue in a vector, the loop of queues is searched and integer is enqueued to a queue which has minimum size among the queues. the following code shows the operation
#include <vector>
#include <queue>
std::vector<std::queue<int> > q
[Code].....
next i am trying to extend my paradigm with the condition, that the integers should be enqueued to the shortest queue until the count of the shortest queue is less than or equal to count of any another queues in the loop of queues.
i want to do something like the code shown below
#include <vector>
#include <queue>
std::vector<std::queue<int> > q
[Code].....
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Feb 28, 2014
I'm working on a homework assignment that asks me to roll two die a user given number of times, find the roll sums, and a few other things. I'm working on it one module at a time and I'm running into two big problems so far.
The first problem is that my int variable rolls changes to a number within the random number generator range of numbers after I run rolldie. I got around this by making a const equal to the user entered value of rolls just so that I could continue developing the program.
My second problem is that the values of the arrays resultsOne[] and resultsTwo[] are changed after running findsum(). Why this is happening and I even tried passing them as const, but that changed nothing. We just started learning about passing arrays to functions, so there might be something big that I'm missing.
Code:
#include <iostream>
#include <cstdlib>
using namespace std;
void rolldie(int resultsOne[], int sizeOfresultsOne, int resultsTwo[], int sizeOfresultsTwo);
void findsum(int resultsOne[], int sizeOfresultsOne, int resultsTwo[], int sizeOfresultsTwo, int tossSums[], int sizeOftossSums);
[Code] ....
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Jul 31, 2013
How can I concatenate two 2-dimensional int arrays into one larger 3-dimensional array. This question is also valid for the 3-dimensional vectors. I know the command for the one dimensional vector as:
std::vector<int> results;
results.reserve(arr1.size() + arr2.size());
results.insert(results.end(), arr1.begin(), arr1.end());
results.insert(results.end(), arr2.begin(), arr2.end());
and for the one dimensional array as:
int * result = new int[size1 + size2];
copy(arr1, arr1 + size1, result);
copy(arr2, arr2 + size2, result + size1);
But I do not know how to make a 3-dimensional array or vector.
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Feb 20, 2013
I have a paradigm in a loop of queues of a vector,if a condition is true,increase sizes of the queue of that particular queue in the loop of queues, if condition is false, the queuesize is left as such in loop of queues. After this operation i need to search the queue sizes of all queues and enqueue in the shortest queue.
I want to do something like the code given below
#include <vector>
#include <queue>
int min_index = 0;
std::vector<std::queue<int> > q
std::size_t size = q.size();
[Code] ....
How to implement this logic?
will q[i].size=q[i].size+5 increase the queuesize by 5 for the ith queue?
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Feb 10, 2013
Code:
char str[40][40];
int number = 7;
for (int i=0;i<number;i++){
printf("enter %d th string::",i+1);
scanf("%s",str[i]);
}
Above, I have a little snippet of a code that I'm trying to figure out. I don't really understand how to implement 2d arrays in C that well. But, I mostly want to know is how and where the strings are being stored, especially with the code below.
Code:
for (int i=0;i<number;i++){
printf("enter %d th string::",i+1);
scanf("%s",str[i]);
}
I know that it's asking the user to enter strings, which will be stored into the 2d array. I just don't understand how it's being stored. Will it be placed in the 1st column or 2nd row or something?
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Feb 6, 2013
I have a problem with a pointer and a bidimensional array. Here's the code:
typedef char t_board[5][4];
int i,j;
t_board *copy (t_board b) {
t_board *ptr;
ptr = (t_board *) malloc (sizeof(t_board));
[Code] ...
After this, I print new_board, and its ok; but the following code after the call to copy, crashes. Don't know why. if I remove the statement new_board = copy(some_board); , the code that follows runs ok.
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Oct 28, 2013
So I started taking a C++ class two weeks ago and we just got to arrays. I am confused on how to pull data from two dimensional arrays. The assignment for this topic reads as follows. Write a program that uses a two-dimensional array to store the highest and lowest temperatures for each month of the year. The program should output the average high, average low, and the highest and lowest temperatures for the year. Your program must consist of the following functions:
a. Function getData: This function reads and stores data in the two dimensional array.
b. Function averageHigh: This function calculates and returns the average high temperature for the year.
c. Function averageLow: This function calculates and returns the average low temperature for the year.
d. Function indexHighTemp: this function returns the index of the highest high temperature in the array.
e. Function indexLowTemp: this function returns the index of the lowest low temperature in the array.
I made the getData function. I do know that i am supposed to more then likely use nested loops on each function to iterate through each column. I have been trying to figure this out. I first saw in my book that the array could be variables so naturally I tryed to make the array loop and increment up the column and row each time a item is stored to make it easier to loop in different functions but then i found out that they have to have a constant value and that doesn't work. Here is the code for index high temp that i have been working on. I honestly feel like i'm over thinking this and its easier then what i'm making it out to be. Here is all of the code.
Code:
#include <iostream>
#include <string>
using namespace std;
void getData(int month);
void averageHigh(int month);
void averageLow(int month);
[Code]...
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Mar 30, 2014
I am having a little trouble finding the minimum value in my two dimensional array. I feel like my code is right, but it could be returning the wrong value. Below is my code, this is just my "minimum" function!
Code:
int minimum( int array[][MAX], int size ) {
int i,j,min;
for( i = 0; i < size; i++ ) {
for( j = 0; j < size; i++ ) {
if( array[i][j] < min ) {
min = array[i][j];
[Code] .....
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Jan 2, 2014
Any way to create a very large 2 dimensional array. I am talking in the order of :
int sl[7000][5000];
I am new to C++. Also is there a better way than arrays to handle such a large amount of integers.
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Feb 15, 2013
i want to make a two-dimensional array that is consisted by objects but i dont want to initialize the objects when i make the array.. i just want to make an array that each of his "cells" has the size of an object.For example,
class Human{
int hm=5;
...
};
and now i want to make a two dimensional array that each "cell" has the size of an Human but not a Human itself.
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Apr 25, 2014
How do I iterate through a two dimensional vector? To iterate through and print the elements of a single dimensional vector I use:
vector<int> a;
for(vector<int>::iterator it=a.begin();it<a.end();it++)
cout<<*it;
How do I do the same for a two dimensional Vector?
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Oct 30, 2012
Suppose I have a two-dimensional stl vector (a vector of vectors), for example:
Code : vector<vector<int> > x;
And then I want to sort the outer vectors in order of the size of their inner vectors. How do I do this?
Usually, with a one-dimensional vector, I can just create a comparison function and use the sort function. For example, if my vector is defined as:
Code:
vector<int> y;
And I want to sort if in terms of the int values of each vector element, then I can sort by using the stl::sort function, with the comparison function defined as:
Code:
static bool SortFunction(int val1, int val2) {
if (val1 > val2) {
return true;
} else {
return false;
}
};
However, with my two-dimensional vector, I use the following comparison function:
Code:
static bool SortFunction(vector<int> vec1, vector<int> vec2) {
if (vector1.size() > vector2.size()) {
return true;
} else {
return false;
}
};
I get a runtime error:
"Debug Assertion Failed!
File: c:Program Files (x86)Microsoft Visual Studio 10.0VCincludealgorithm
Line 3686
Expression: invalid operator<"
Why is this?
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Aug 14, 2013
I've got a VERY experimental function which takes data stored to a file and assigns it to a multidimensional array on the heap. It's designed for infinite dimensions by recalling itself with updated information but I don't think this is very safe.
The template function creates a heap array using a TYPE**, and recalls itself to create the new dimensions. I want to replace this with the much safer method of assigning just a single heap memory array and then only assign using the recalling method (unless I can find anything else).
To do this though I need to know how single dimensional arrays are stored on the heap, as well as multi-dimensional (for n dimensions). Where I can find this information?
btw I only need this for the Windows operating system, 32bit, I'm not exactly sure what 'C++ style' this is but I'm using Microsoft's Visual Studio Express 2012 as my IDE, so whatever that uses.
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Jan 29, 2015
I need to create subfunctions to do basic Matrix mathematics (addition, subtraction, etc.) I need to be able to pass bot of my Matrices to subfunctions. I started with the addition sub function and I cant get the code to run. I keep getting expected primary-expression before ']' token error for line 75.
#include <iostream>
#include <stdio.h>
using namespace std;
[Code].....
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Apr 8, 2014
I am working on the game of fifteen.Yes this is home work. I was wondering if it is possible to save the indexes of an element in a two dim array. I need to find the position of the space in the two dim array save it, find the position of the tile which is passed in as an int and swap the two if they are adjacent. Here is my code
Edit: I can do this by saving i and j in separate int variables but is there a more elegant way of doing this
int board[MAX][MAX];
void init();
void swap(int* lhs, int* rhs);
[Code].....
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Apr 14, 2013
I receive unexpected outcome in my program. Instead of getting all combinations of 0, 1, 2 (i.e. 000, 001, ..., 222) I get only 000 001 002 010 011 012. The idea of the progarm is to create a crystal lattice. Each atom of the lattice has 3 coordinates (x, y, z). That's why I create class Atom. Then I create 3-dim array of the type derived from class Atom. Now each element of the class will represent an atom.
Code:
#include <iostream>
using namespace std;
class Atom {
public:
float x, y, z;
[Code] .....
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Nov 5, 2014
I have to create a class to represent a 2 dimensional vector. I need to include certain member functions such as a function to find magnitude of the vector, and one to find the dot product of that vector with another vector, and several others too. That's all fine. A stipulation of the problem is that I must include a constructor which can take cartesian form of the vector and a constructor which can take polar form of vector. Since this involves overloading the constructor the best solution I have come up with is to create the object with either doubles or floats so that the compiler can choose the correct constructor. This seems like a really bad idea. Is there a way I can get the compiler to choose the correct constructor without doing it using the precision? Here is a sample of my header file, there are many more member functions
class Vector{
public:
Vector(double x, double y, double v, double w){
myArray[0]=x;
myArray[1]=y;
additionalArray[0]=v;
additionalArray[1]=w;
[Code] .....
In my .cpp file the object is created with either four doubles or four floats depending on which constructor I want to implement. There must be a better way. Additional Array is created for use in member function which require calculations with a second 2d vector.
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Mar 6, 2015
For the past couple of weeks I have been working on a template to hold two-dimensional arrays. Right now I am puzzling over an indexing question.
There are many places in the template where I would like to use initializer_lists to refer to user-specified row and column ranges, particularly in member function arguments. A typical example would be a member function whose declaration would be along the lines of:
Code:
Array<Type>::some_function(std::initializer_list<int> columns, std::initializer_list<int> rows); which could get called via
Code:
arrayInstance.some_function({3:4}, {5:8});
It would be really nice to be able to use Matlab-style indexing to specify the last column, or the last row, in the Array object -- along the lines of
Code:
arrayInstance.some_function({3:4}, {5:END}); where END takes the value -1, and can be defined in Array, or somewhere else.
The way I have tackled this so far was to write myself an Indices PODS class with two elements to hold start and finish values, and a constructor-from-initializer_list that looks something like this:
Code:
Indices::Indices(std::initializer_list<int> range, int replace_value) {
int const *it = range.begin();
start = (*it == END) ? replace_value : *it ; ++it;
finish = (*it == END) ? replace_value : *it ;
...
}
So the elements of "range" give the values of Indices::start and Indices::finish -- but if either of them are entered as END by the user, they will be replaced by replace_value. (The default value of replace_value is END, so Indices::start and Indices::finish will never change if it is omitted.)
I also defined an Indices::endset(int) function to do the same thing for existing Indices objects:
Code:
Indices::endset(int replace_value) {
if (start == END) start = replace_value;
if (finish == END) finish = replace_value;
} Using Indices::endset, you can code up Array::some_function by modifying the above signature to something like
Code:
Array<Type>::some_function(Indices columns, Indices rows) {
columns.endset(this->M);
rows.endset(this->N);
...
}
This does work, and I've been able to use it in practice. However, it is klutzy. What I would really like to be able to do is have the Indices constructor handle value-replacements in "columns" and "rows", instead of needing to put calls to Indices::endset in every single Array<Type> member function that uses this approach.
The basic problem is that, when Array<Type>::some_function is called, there is no easy way of inserting Array<Type>::M and Array<Type>::N into the optional argument of the Indices constructor when "columns" and "rows" are being built.
The Indices class needs somehow to get access to these, and know which one is being used, M or N. So it needs to have some sort of deeper connection to Array<Type>, but I don't know what that connection should be.
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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] ....
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Jan 9, 2015
I have a firmware application that works well where I display simple text messages on an LCD screen. At the moment, the User Interface is only in English and I have the text strings simply declared as follows:
Code:
static char msg1[] = " Welcome ";
static char msg2[] = " Data Read ";
//etc...
I want to add a variable that can set the language dynamically from an external device, and so I thought I could do the following:
Code:
#define ENG 0
#define FRE 1
#define GER 2
//...
static char msg1[ENG][] = " Welcome ";
static char msg2[ENG][] = " Data Read ";
[Code] .....
writeLCD(msg1[cLang][]); When I try to compile the above I get a compiler error at the "static char msg..." declarations. The error is: "error: array type has incomplete element type"
Is this method valid, but I have a simple syntax problem with the arrray declarations? Or is this method unworkable and I should find a different method?
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Jul 30, 2014
In pseudocode and in C code, declare two 1-dimensional parallel arrays of Integers to store the age and weight of a group of people that will hold the information of up to 10 people. Use a For loop to iterate through the array and input the values. This is the code i have, but my array is showing up as 11 and not 10?
Code:
#include <stdio.h>
int main() {
//Define Variables
float Age_Data[10],Weight_Data[10];
float Age_Input,Weight_Input;
[Code] .....
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