Global and Local Stiffness Matrix Composition in 2D - Finite Element Methods 

Thanks! Glad I could help

Heng Si Hwa the local stiffness matrix formation of cos and sin that I have shown is the general formulation of such. If you are looking for the full derivation I suggest having a look through your textbook :)

hey, were you able to find connectivity matrix for galerkin method. If yes do let me know , thank you.

symetric around the diagonal. so K[a,b] = K[b,a]