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Initializing multidimensional array C++


Initializing multidimensional array C++

By : bd1234
Date : November 19 2020, 12:41 AM
I hope this helps . In C++, when I want to initialize an array of some length (of integers for instance) I can just write , Using std::vector is the safe way:
code :
std::vector<std::vector<int>> mat(size1, std::vector<int>(size2));
int** mat = new int*[size1];
for (std::size_t i = 0; i != size1; ++i) {
    mat[i] = new int[size2];
}
for (std::size_t i = 0; i != size1; ++i) {
    delete [] mat[i];
}
delete[] mat;


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C# programmatically initializing multidimensional array

C# programmatically initializing multidimensional array


By : Lund
Date : March 29 2020, 07:55 AM
it should still fix some issue You can decide on the size of the array at runtime, but once you create it, it will become immutable, and you won't be able to change the size of the dimensions.
code :
int z = ... ;
int[,] array = new int[get1stDimensionLength(), z];
// programmatically fill the array
for (int i = 0; i < array.GetLength(0); i++) {
    for (int j = 0; j < array.GetLength(1); j++) {
        array[i,j] = 18;
    }
}
Trouble with initializing multidimensional array

Trouble with initializing multidimensional array


By : user3625277
Date : March 29 2020, 07:55 AM
I wish this help you The idea of an array is to keep all the data in memory contiguous, this would not be achieved with the approach you are using, I would recommend using a C style memory management with RAW memory for a low level fast, thigh and possibly dangerous solution, or change to a different data container like the vector (or others) where you can add elements similar to what you want and the memory will still be contagious like the simple array. Although depending on the size of your problem it might be an overkill to use a vector.
Initializing a multidimensional array

Initializing a multidimensional array


By : user3845969
Date : March 29 2020, 07:55 AM
will be helpful for those in need If you want to copy the values of temp array , instead of "=", you should use memory copy
code :
memcpy( test[i], temp, sizeof(temp[192]));
Initializing multidimensional dynamical array in c++

Initializing multidimensional dynamical array in c++


By : Christopher Oezbek
Date : March 29 2020, 07:55 AM
With these it helps You show a 3D array declared as permutazioni[variable][10][2] but when you tried to dynamical allocate that you switched the last two dimensions.
You can do something like this:
code :
#include <iostream>

#define NVAL    3
#define DIM_2  10 // use some more meaningfull name
#define DIM_3   2

// assuming something like
struct Card {
    int suit;
    int val;
};

int main() {
    // You are comparing a 3D array declared like this:
    Card permutations[NVAL][DIM_2][DIM_3];

    // with a dynamical allocated one
    int valid = NVAL;    
    Card ***perm = new Card**[valid];
    // congrats, you are a 3 star programmer and you are about to become a 4...
    for ( int i = 0; i < valid; i++ ){
        perm[i] = new Card*[DIM_2];
        // you inverted this ^^^ dimension with the inner one

        for (int j = 0; j < DIM_2; j++)
            // same value   ^^^^^
            perm[i][j] = new Card[DIM_3];
            // inner dimension    ^^^^^
    }

    // don't forget to initialize the data and to delete them

    return 0;
}
initializing multidimensional array in C

initializing multidimensional array in C


By : Bohou Zhang
Date : March 29 2020, 07:55 AM
hop of those help? I am trying to initialize a multidimensional array in the following way but I am not sure if it is correct. I am re-initializing large tables implemented using multidimensional arrays and I am not sure how to do it. I need to initialize the entire row at a time and cannot initialize the elments individually. , Use the following declaration instead:
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