I am confuse about the coordinates.dat and nodes.dat file using in the "main.m" file of the code given in below link. From where did He get those two files for input.??
The files coordinates.dat and nodes.dat are included in the .zip file.
You need to click the big blue Download button to get the complete submission in a .zip file, and then unzip it onto your MATLAB path (e.g. the current directory).