"Joshua " <Hogy88@aol.com> wrote in message news:email@example.com... > Hello, > > I am working with the Finite Element Method using MATLAB and I have run > into a technical problem. For the basic finite element procedure, a > stiffness matrix K and a force vector F are created, and the results we > want to find are solved using > > d=K\F > > where K and F have no variables, only numbers. Now, however, I am doing a > vibration problem and need some help to put a nonlinear equation into the > matrix, or to solve it simultaneously. > > Here's my problem: > > I have a square matrix K of only numbers and my force vector F is zeros. > I cannot just solve > > d=K\F > > because it gives me the trivial zero solution. I have to insert an > equation based on a diagonal matrix M such that
Use the NULL function to determine a basis for the nullspace of K.