An Array Example

Finally, here is an example showing how to use the array class to define and print a three-dimensional array of integers:

#include <rw/math/mtharray.h> // 1

#include <iostream.h>

int main()

{

RWMathArray<int> A; // 2

A.resize(3,3,3); // 3

A = 3; // 4

A(1,1,1) = 0; // 5

cout << A; // 6

}

// 1 This statement declares the class RWMathArray<T> an array of type T.

// 2 Here we define A to be an array of integers using the default constructor. This constructor takes no arguments and constructs a null (0- dimensional) array. Why use it? One reason is that such a constructor is required to declare C-style arrays of RWMathArray<T>s:

RWMathArray<double> aa[5];

Default constructors exist for all the vector, matrix, and array classes.

// 3 The array is resized to be a three-dimensional array of size 3x3x3.

// 4 Each element in the array is set to 3.

// 5 In this line, the middle entry of the array A is set to 0.

// 6 In the last line, the array is printed out.