e255.m

matlab算法集 matlab算法集

%-----------------------------------------------------------------------
% Example 2.5.5 Approximate Condition Number
%-----------------------------------------------------------------------
   clc                 
   clear
   A = [100 -200 ; -200 401];

   fprintf ('Example 2.5.5: Appoximate Condition Number\n');
   show ('A',A)
   a = norm(A,inf);
   show ('||A||',a)
   b1 = [1 ; 0];
   x1 = A\b1;
   show ('Approximate K(A)',a*(norm(x1,inf)/norm(b1,inf)))
   show ('Actual K(A)',cond(A,inf))
 %-----------------------------------------------------------------------