getbasematrix.m

国外专家做的求解LMI鲁棒控制的工具箱,可以相对高效的解决LMI问题

function Q=getbasematrix(X,ind)
%GETBASEMATRIX Internal function to extract basematrix for variable IND

% Author Johan L鰂berg 
% $Id: getbasematrix.m,v 1.2 2004/07/01 11:17:10 johanl Exp $  

if ind==0
  base = X.basis(:,1);
  Q = reshape(base,X.n,X.m);
  return;
end

here = find(X.lmi_variables==ind);
if isempty(here)
  Q = sparse(X.n,X.m);
else
  base = X.basis(:,here+1);
  Q = reshape(base,X.n,X.m);
end