C++ :: Create Matrix Of Data That Add Values Based On Reading Get From DVM
Apr 22, 2012
Ok I'm trying to create matrix of data that I can add values to based on a reading that I will get from a DVM. I'm using a 3d vector to do this. I need to keep track of the serial number, the day and within day I need to take two readings at different temps, this will continue for 7 days.
The rows of my 3d vector will be the days, the colums will be the serial numbers the depth will be the reading at the different temps.
What I need to do is compare the first element (days) and when it is greater then or equal to 4 I will perform calculations of the readings. So all I want to do is compare the first element of the vector, How do I do this?
Here is what I got
Code:
#include <vector>
typedef std::vector<double> Double1D;
typedef std::vector<Double1D> Double2D;
typedef std::vector<Double2D> Double3D;
#define HEIGHT 5
#define WIDTH 3
[Code]....
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Jul 24, 2014
I have this assignment where I have to create a map based hash table for a sparse matrix. The professor has provided some code and I'm supposed to fill in parts of it to make it work.
He has given us a class sparseMatrix which we need to provide a hash function for. This hash function is to be defined in a Class TupleHash which is inside sparseMatrix. I think I got that part down. What is really confusing me is what he has done with some typedefs.
For one of them I had to declare an unorderd_map that maps a struct Tuple on to the class template argument Object. I did that like so:
typedef unordered_map<Object,Tuple,TupleHash> HashTable;
The next typedef was given to me like so:
typedef typename HashTable::value_type valueType;
This is giving me a world of unintelligible error messages. This is how it starts.
In instantiation of 'struct std::__detail::__is_noexcept_hash<int, sparseMatrix<int>::TupleHash>':|
recursively required from 'struct std::__and_<std::is_default_constructible<sparseMatrix<int>::TupleHash>, std::is_copy_assignable<sparseMatrix<int>::TupleHash>, std::__detail::__is_noexcept_hash<int, sparseMatrix<int>::TupleHash> >'|
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Apr 24, 2013
I want to create a binary file based on some hex data :
Ex Input Hex :54313032202020303030
Out put like :6
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Apr 1, 2014
I have a problem I am working on where I need to sort some data based on the values of a string of bits. The strings look like this,
010000001110000000
there are 18 bits, 1 means a feature is present, 0 means the feature is absent.
Each of these string has 4 on bits. I need to sort them such that I have the longest possible runs with 3 of the same on bits. It doesn't matter which 3 bits are on, I am just looking to order them in blocks with the longest possible runs. As a second step, the ordered blocks will be sorted by size large>small.
The following data is ordered like I need it to be.
Code:
// block 1, run of 12, keys 1,2,11 are identical (key 12 is also identical)
011000000001100000
011000000001100000
011000000001100000
011000000001100000
[Code] .....
This is the sort order that I am looking for. I need to be able to take a list of the bit strings in any particular order and sort them into the order above. The algorithm would need to recognize that there are 4 on keys and then look for groupings of three common on keys.
This is more of an algorithm question than one about specific implementation in code. I generally assume that most programming problems have been solved one way or another, so I don't know much about analyzing and manipulating strings of bits.
Is there a standard method for this kind of pattern recognition?
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Mar 25, 2013
I am trying to read an array values from Tmin.txt file. I take array size from user viz. number of raw & column and then, read the following data from Tmin.txt file which look like this:
20 40 20 25 30
20 30 40 20 25
20 40 20 25 30
20 30 40 20 25
30 40 40 30 40
I am using getline, and then converting it to int by using atoi. But my code is not working.
Code :
// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
[Code] ....
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Nov 19, 2014
Here is the problem:
Write an algorithm such that if an element in an M * M matrix is 0, its entire row and column is set to 0.
Your function prototype may look like the following:
void setZeros ( int size, int arr[][size] );
Heres what I have:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define SIZE 3
void scan_matrix(int arr[][SIZE]);
void print_matrix(int arr[][SIZE]);
void initiailize_matrix(int arr[][SIZE]);
void set_zeros(int matrix[][SIZE]);
[code]....
I'm not sure on how to scan zero for this code and I have bolded some comments that I am having trouble with as well.
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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 have a class called Book and I am trying to create a dynamic pointer based array of the class. When I try to run the program I keep getting the error: pointer being freed was not allocated at the line of code that says "delete [] A;". I am using Xcode to run the program.
Book *changeArraySize(Book *A, int &size, double factor) {
int i;
int newsize = size*factor;
Book *A2 = new Book[newsize];
[Code] ....
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Mar 12, 2013
I want to create a text-based game with C++, running on the console. I have made some other text-based console games.
Which is the most interesting text-based game to learn how to program for beginners?
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Apr 4, 2013
I have to be more code specific (I usually try to abstract my code). As you can see I use a lot Qt classes... however they work very similar to standard libraries, so it should be not a problem to look at this question.
class FrameManager {
QList<FRAME> frameData;
public:
int frameID(int grpno, int imgno);
};
[Code] ....
Now I know the example search only the ID and doesn't allow the access of the actual data... this is not the question.
The problem is... I will need to define an AnimationManager class that will collect sequence of frames (identified by the unique couple of value) in animations... so it will need to use a massive search of item from the couple of value (and not ID, unluckly)
I fear if I use an approach similar to the one written in the example (search from the start to the end until the element is found) can be very unefficient.
In the same time the AnimationManager should always know if frame exist or not (if not exist an invisible image will be shown) and if in the meantime changed.
Another problem is that I cannot order the data sequence inside FrameManager (becouse it is expected to mantain the original order, even when it is chaotic).
I tried to take a look around QMap (or std::map) but it is not clear at all how the optimiziation works and how I can use it in my case
I tried also to take a look at the "hash" concept, but for me it is too complex to understand deeply.
So... I am feeling like I am entrapped... I am unable to find a good "exit"...
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Sep 1, 2014
New file_sorter.c:
#include <stdio.h>
#include <stdlib.h>
#include "sort.h"
#include <string.h>
[Code].....
My issue is now a segmentation fault in my sorting algorithm. In my assignment I was suppose to implement quick and insertion sort for the file, and organised strictly by ASCII values. We were allowed to look up generic algorithms for the sorts, but we have to convert them to comparing char arrays.
I haven't started trying to configure quick sort yet, but I'll supply the generic algorithm as well. keep in mind that the first line in the file contains the number of lines in the file. I'll try not to disappear this time!
sort.c :
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
[Code]....
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Feb 18, 2015
Question for coding transivity in c++
a->b b->c then a->c
It should contain a main code reading from boolean matrix class. for ex)input file is
8
0 1
1 2
2 3
3 4
4 5
5 6
6 7
8 is the number of no.
what program should do.
1. check if 0->7 first(0th element)->last
2. check every 5th(5,10,15...) element is to last 5->7
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Nov 29, 2014
I'm trying to read a "pointer-based" maze .txt. The first letter in each row corresponds to the room letter...then the letters that follow are North node, East node, South node, and West node respectively. The asterisk indicates an empty room or not a valid option.
Here is what I have come up with, what is happening is after the file is parsed by read_maze it is calling my is_empty function indicating that there is no maze because it doesn't go into the else statement here.
I've attached a sample input file:
maze.txt (130bytes)
Number of downloads: 19
We can't assume the rooms will be in order alphabetically A - Z, We are expecting a maximum of 12 rooms and there is a space between each letter or asterisk.
void Maze::read_maze(string FileName){
string line;
ifstream inStream;
inStream.open(FileName.c_str());
int test = inStream.peek();
int i = 0;
if (!(inStream.fail())){
while (!inStream.eof() && test != EOF){
[code]....
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Mar 24, 2014
I'm trying to increment the values in a vector, not the vector size, based on variable input. Basically I have a vector of size 10, and all of its values are initialized at zero. The program counts the frequency of numbers 0-9 in a four digit user input. This is what I have (I want it to work so badly but the compiler says that I'm using a pointer to a function used in arithmetic):
for (int i=0; i < num_slots; ++i) {
++guess_frequency[guess[i]];
}
I just want to know if you can increment values within a vector:
E.g.
change
0 0 0 0 0 0 0 0 0 0
to
1 0 0 0 2 0 0 1 0 0
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Jun 24, 2013
I am having a problem on how will I create a large matrix to be solved using numerical methods. Say I have a 500 x 500 matrix and want to find these 500 equations. How will I do it? To be exact, here is a sample problem
| -2 1 . . . . . . . || x1 | |h^2|
| 1 -2 1 . . . . . . || x2 | |h^2|
| 0 1 -2 1 . . . . . || . | | . |
| 0 0 1 -2 1 . . . . || . | = | . |
| . . . . . . . . . 1 || . | | . |
| . . . . . . . . 1 -2||x500| |h^2|
Where h = 1/(n + 1)
Solutions on finding would be gauss elimination, Successive overrelaxation, Jacobi Iteration, biconjugate gradient method and Thomas algorithm. I want to compare the accuracy, with tolerance of 10^-6
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Feb 11, 2014
I am trying to create a random 3x3 matrix and print it out in a text file using basic functions. My code below will not compile.
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
//nxn Matrix = 3x3
const int ROWS = 3;
const int COLS = 3;
[Code] .....
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Jun 27, 2013
i have to create a console based application in c language that can join and split bitmap images. the requirements of the application are as follows :
1. Split Image
Enter number of parts:
Enter source image path:
Enter destination folder:
2. Join Images (all images should be of same width and height)
Enter image path:
Join more Image (y/n):
3. Exit
Take care of following things:
- Application should show number of images processed while running.
- Acceptable Image format is BMP only.
- Application should give all the validations for correct image name, type, size, path, etc.
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Apr 12, 2015
I need to create a program that prints a certain number of asterisks based on user input. The user inputs 5 and I want my program to output "*****". How would I do this in C? I've tried printf("%#**", myvariable) but this does not work it only prints "*".
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Jun 29, 2013
I have the following void function devised to assign "+1" or "-1" to each element of a matrix at random. While the function does what I want, when I print the values of the matrix all are set to zero:
#include <vector>
#include "aRand.h"
#include <iostream>
void initConfig(std::vector<std::vector<int> > premat, int nL, int nN) {
int * pnRand;
pnRand = 0;
[Code]...
The function pnRand_plus returns a pointer to an array of random numbers from 1 to 100, with seed time(NULL) + i. The values printed in main are zero, despite the values printed during the function run are fine (-1s and +1s).
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Jun 1, 2013
I am attempting to create a program which calculates the product of 4 vertical values in the matrix. The numbers are supposed to be randomly generated and the size of the matrix is given through the command window.
However I seem to have either not pointed my matrix through all of my functions correctly, or my logic is off somewhere as I keep getting this output regardless of the size of matrix I put in:
"the location of the highest horizontal line product is: 5 0 and is the number: 0
The overall max value is 4196352 at the above coordinates."
using namespace::std;
//srand(time(0));
int h_line(int**, int, int);
int v_line(int, int,int);
int diagnol_left(int,int,int);
[Code] .....
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Jul 27, 2013
I have an array matrix called tmat,,and i know that in every row of tmax there are values which repeat two times...and am writing a code to extract the values WHICH DOES NOT REPEAT into another matrix called tcopy...the codes compiles fine...and it writes nicely to file...but without the desired result...
One last question...how can i get the array tcopy written to file in the form 5x3...and not all the figures in line one after the other? i mean i wish to see the matrix like a matrix on file..not like a list of numbers....
Code:
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
const int R = 5;
const int C = 5;
[Code] ....
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Dec 23, 2014
I have a area in my Project where i need to display a title and content in two text boxes. The Data base tables are:
ID | Title | Content
This is what I have so far, I know I am on the right track, I just cant figure out how to get each box to display based on the ID.
private void frmMain_Load(object sender, EventArgs e){
try {
string connStr = ConfigurationManager.ConnectionStrings["sdcAssistDB"].ConnectionString;
OleDbConnection dbConn = new OleDbConnection(connStr);
dbConn.Open();
[Code] ....
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Jun 4, 2012
I am really desperate on trying to make my code work. The code is to find the eigen values of any given matrix of dimension NxN. The input can be the diagonal of any NxN matrix alongwith its subdiagonal. The code works fine for N~350 or so but when i go beyond that these errors appear.
First-chance exception at 0x00425ea4 in divide.exe: 0xC0000005: Access violation writing location 0x01141000.
Unhandled exception at 0x00425ea4 in divide.exe: 0xC0000005: Access violation writing location 0x01141000.
But as i have never declared any variable statically and when i dynamically allocating memory with variables it should work like it does for smaller N values.
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Apr 23, 2013
Generate a binary ascii characters(weird character ) based on Hex:54313032202020303030 data in C++
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Feb 7, 2014
Player is given choice of x number of Races This choice changes the player's base stats. Then player is given a choice of x number of Classes (archer, warrior, etc.) This choice determines how the player's stats will change upon leveling up.
#include <cmath>
#include <iostream>
#include <ctime>
[Code]....
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Feb 6, 2014
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Code:
#include <iostream>
#include <string>
/*Function Declaration*/
void createItem();
void returnItem();
//Items structure
[code]...
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