## Filling up a 2d vector containing scruct

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I have a small struct containing a bool, char & two ints. But when I try to run this code, I get into a problem.

struct Struct { bool check; char display; int x,y; }; typedef vector<Struct> Array; vector<Array> Matrix; for (int i = 0; i < rows; i++) { vector<Struct> temp; for (int j = 0; j < cols; j++) { temp[i].push_back(Matrix); } Matrix.push_back(temp); }

I want to fill my 2D array so that I would later be able to write something in terms of:

for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { Matrix[i][j].display = '*'; } }

However, as of now, I get the error: "temp has no member push_back()".

You are referring `temp[i]`

. As temp is not an array or a vector of vectors it can't be used like that. When you do `temp[i]`

you are getting the `i'th`

element of vector temp, which is a `Struct`

, which has not a `push_back`

method.

You can do something like this to initialize the `Matrix`

:

.... for (int i = 0; i < rows; i++) { vector<Struct> temp; for (int j = 0; j < cols; j++) { Struct s; s.check = true; s.display = 'c'; s.x = i; s.y = j; temp.push_back(s); } Matrix.push_back(temp); } ....

**2D vector in C++ with user defined size,** Initializing 2D vector "vect" with. // values. vector<vector< int > > vect{ { 1, 2, 3 },. { 4, 5, 6 },. { 7, 8, 9 } };. // Displaying the 2D vector. for ( int i = 0; i < vect.size(); i++) Returns a newly allocated vector containing the elements in the range [at, len). After the call, the original vector will be left containing the elements [0, at) with its previous capacity unchanged. Panics. Panics if at > len. Examples

As the above answers have already mentioned you are trying to call `push_back()`

on `Struct`

type rather than on `std::vector<Struct>`

type, so your compiler is complaining the same. Try below:

void initMatrix(int rows, int cols) { for (int i = 0; i < rows; i++) { Array temp; for (int j = 0; j < cols; j++) { Struct s; // Struct s = initStruct(); // if you want to initialize with other values temp.push_back(s); } Matrix.push_back(temp); } }

**filling a 2d vector - C++ Forum,** So I've created a 2d vector " mytable" and I wish to fill it with #include <vector> using namespace std; struct DataStruct { int x; double y; C++ Filling a 2d Vector with Structs. Ask Question Asked 4 years ago. Making statements based on opinion; back them up with references or personal experience.

You are mixing the types and your compiler issues an error :

typedef vector<Struct> Array; vector<Array> Matrix; // a vector of vectors for (int i = 0; i < rows; i++) { vector<Struct> temp; for (int j = 0; j < cols; j++) { // temp[i].push_back(Matrix); -> wrong // Matrix is a vector of vectors. // but temp is a vector of structs. temp.push_back(Struct()); } Matrix.push_back(temp); //push the vector into the vector }

**How can I resize a 2D vector of objects given the width and height ,** <int>> M; //int m = number of rows, n = number of columns; M. The ‘fill’ function assigns the value ‘val’ to all the elements in the range [begin, end), where ‘begin’ is the initial position and ‘end’ is the last position. NOTE : Notice carefully that ‘begin’ is included in the range but ‘end’ is NOT included.

Use this type of mechanism to make 2D array of Structure.

vector < vector<Struct>> xyz; vector<Struct> abc; //set value ++++++++ Struct _st; _st.check = true; _st.display = NULL; _st.x = 10; _st.y = 10; //set value -------- abc.push_back(_st); xyz.push_back(abc);

**C++ week 13, Arrays, C-strings, typedef,** How do you declare a two dimensional vector in C++? A structure array is a data type that groups related data using data containers called fields. Each field can contain any type of data. Each field can contain any type of data. Access data in a field using dot notation of the form structName.fieldName .

You can simply use resize() with a default row vector of default elements :

matrix.resize(rows,·vector<Struct>(cols));

Below an example in C++11, with a clear() before resize() in order to reinit with default values an already used matrix.

#include <vector> using namespace std; struct Struct { bool check = false; char display = '\0'; int x = 0, y = 0; }; void init_matrix(vector<vector<Struct>>& matrix, size_t rows, size_t cols) { matrix.clear(); matrix.resize(rows, vector<Struct>(cols)); }

**Creating a Matrix using 2D vector in C++ – Vector of Vectors ,** Initializing Vector of Vector – 2D vector. A vector can be initialized using parametrized constructor i.e.. std::vector <NUMBER OF ELEMENTS, To simplify the creation of large vectors, you can define a vector by specifying the first entry, an increment, and the last entry. Matlab will automatically figure out how many entries you need and their values. For example, to create a vector whose entries are 0, 2 , 4, 6, and 8, you can type in the following line: >> 0:2:8 ans = 0 2 4 6 8.

**Initialize a two-dimensional vector in C++,** The fill constructor creates a vector of specified number of elements and fills with the specified value. This example shows how to index into a structure that is nested within another structure. The general syntax for accessing data in a particular field is. When a structure is scalar (1-by-1), you do not need to include the indices to refer to the single element. For example, create a scalar structure s, where field n is a nested scalar structure

**How to create a 2D vector array using std:vector<>,** First I create an array of vectors of size r ( this would be the no of rows of the 2d vector ). int r;; cin>>r;; vector<int> v[r];. Next , I fill up the r rows with the number of Running into an issue trying to fill a vector of structs. I am completely stuck. Here the assignment question Using the data file provided on the next page, write the C++ program to implement a vector of structs containing wines, vintage and scores. Create a file names wines.dat using the data on

**std::array,** array. (C++11). vector · deque · forward_list. (C++11). list · set · multiset · map std::array is a container that encapsulates fixed size arrays. overwrites every element of the array with the corresponding element of another array fill. fill the container with specified value (public member function) [edit]. Search for 2d Vector Graphics on the New KensaQ.com

##### Comments

- I understand, thank you. Would it be possible to create such a 2D array ? I'm still not sure of how I would fill up my array.
- What is your final necessity? To have a 2d array of
`Struct`

? - Yes, exactly. I want to be able to give certain positions in my
`Matrix[i][j]`

values which are contained in`Struct`

. I was able to do it by`#define SIZE`

and then`Matrix[SIZE][SIZE]`

. However, I need my matrix size to be dynamic, and this is where I run in to the issue with filling the array. - Works like a charm. Thank you !
- Great! You go on and accpet the answer that helped.