Remove one matrix variable from LMI problem
newsys = delmvar(lmisys,X)
delmvar removes the matrix variable X with identifier X from the list of variables defined in lmisys. The identifier X should be the second argument returned by lmivar when declaring X. All terms involving X are automatically removed from the list of LMI terms. The description of the resulting system of LMIs is returned in newsys.
Consider the LMI
involving two variables X and Y with identifiers X and Y. To delete the variable X, type
lmisys = delmvar(lmisys,X)
Now lmisys describes the LMI
with only one variable Y. Note that Y is still identified by the label Y.