Use Matlab code to determine the nodal forces for $($a$)$ a linearly varying pressure on the edge of the triangular element

shown in Figure by evaluating the surface integral. Assume the element thickness is equal to $0\mathrm{.}5$ in $.$

Let E$=30$ xx$10^(5)$psi$,$v$=0\mathrm{.}25,$ and the element is fixed support at node $1.$ Calculate the principle stress

and principle angles for this triangle. Using matlab