Matlab Code to Evaluate View Factors for a 2D Enclosure

This code calculates the view factors between the internal surfaces of an
enclosure by dividing each surface to small grids in order to be able to
do further heat transfer analysis for variable surface temperatures or
heat fluxes.
The inputs to this code include:
- The x-coordinates of the corner points of the enclosure
- The y-coordinates of the corner points of the enclosure
- The desired number of divisions for each side (a)
By running the code, it will produce a matrix F containing the view factors from each sub-surface to all other sub surfaces, and a smaller matrix f containing the view factor from each entire surface to others.