3D elastic Finite Element MATLAB code + Abaqus Verification

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I wrote a finite element code for three-dimensional analysis of elastic body using MATLAB programming language.
Here is a video of the results + its verification with Abaqus:

Output results are shown in Tecplot; hexahedron elements are used; Basic conjugate gradient method (BCG) is used to solve linear solutions to be able to solve large number of nodes and elements.
Contact me via email (hosseinali.sut@gmail.com) for MATLAB files (functions):
main.m
basicconjugategradientsolution.m
B.m
rNrkb.m