With reference to the screenshot, the code extracts the element numbers of all points lying on:
1. elements lying between P and B, into the array "top"
2. elements lying between Q and D, into the array "right"
3. elements lying between R and F, into the array "bottom"
4. elements lying between S and H, into the array "left"
corners = [topleftelement toprightelement bottomrightelement bottomleftelement];
sunil anandatheertha (2021). Identify edge and corner element numbers (https://www.mathworks.com/matlabcentral/fileexchange/34657-identify-edge-and-corner-element-numbers), MATLAB Central File Exchange. Retrieved .
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