I would like to use the Eigtool of professor Trefethen for pseudospectra but I have a generalized eigenvalue problem to solve: $$ \lambda M x = K x. $$ It seems that Eigtool takes only one matrix as input. Is it possible to use the Eigtool my case too? I.e. having two matrices as input? In addition, my matrices are really big, but sparse, so I do not think that it is possible to invert them.
In my case $M$ is singular and not invertible.