Quadratic Jacobian
Contents
function f2 = quadratic_Jacobian(Assembly,x,y)
Quadratic Jacobian
this function computes the Jacobian of the quadratic component of the nonlinear internal force in global coordinates at the element level. The Jacobian is evaluated along the direction (x) and acted on the vector y. Hence, the output is a vector.
x = Assembly.unconstrain_vector(x);
y = Assembly.unconstrain_vector(y);
f2 = Assembly.constrain_vector(Assembly.vector('DF2',x,y));
end