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    <p>Returning a 2D vector is less complicated.</p> <pre><code>#include &lt;vector&gt; #include &lt;iostream&gt; using namespace std; typedef std::vector&lt;std::vector&lt; int&gt; &gt; vector2D; int image[5][5] = { {0, 0, 0, 0, 0}, {0, 1, 1, 1, 0}, {0, 0, 1, 0, 0}, {0, 1, 1, 1, 0}, {0, 0, 1, 0, 0}, }; int kernel[5][5] = { {0, 0, 0, 0, 0}, {0, 1, 1, 1, 0}, {0, 0, 1, 0, 0}, {0, 1, 1, 1, 0}, {0, 0, 1, 0, 0}, }; vector2D erode(int image[5][5], int kernel[5][5]) { vector2D image_process_data ; //create 2D vector array image_process_data.resize(5); for(int i = 0; i &lt; 5; i++) { image_process_data[i].resize(5); } //perform calculations for (int ix = 0; ix &lt; 5; ix++) { for (int iy = 0; iy &lt; 5; iy++) { image_process_data[ix][iy] = image[ix][iy] + kernel[ix][iy]; } } //return the 2D array return image_process_data; } int main( ) { vector2D new_image; new_image = erode(image, kernel); //display new_image for (int ix = 0; ix &lt; 5; ix++) { for (int iy = 0; iy &lt; 5; iy++) { cout&lt;&lt;new_image[ix][iy]&lt;&lt;" "; } cout&lt;&lt;"\n"; } return 0; } </code></pre> <p>How to set up a 2D vector array:</p> <pre><code>#include &lt;vector&gt; #include &lt;iostream&gt; using std namespace; #define HEIGHT 5 #define WIDTH 3 int main() { vector&lt;vector&lt;double&gt; &gt; array2D; // Set up sizes. (HEIGHT x WIDTH) array2D.resize(HEIGHT); for (int i = 0; i &lt; HEIGHT; ++i) array2D[i].resize(WIDTH); // Put some values in array2D[1][2] = 6.0; array2D[3][1] = 5.5; return 0; } </code></pre>
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