% Matlab diary from cs110a class #7, Jan 19 2005.
%
% This is what I typed in class.  
%
% Type it into Matlab yourself to
% reproduce the output I showed.

A = golub(7)
b = rand(7,1)
x = A \ b
r = b - A*x
A
b = A * [1; 1; 1; 1; 1; 1; 1]
sum(A,1)
sum(A,2)
x = A \ b
xstar = ones(7,1)
error = x - xstar
lugui(A)
residual = A*x - b
A
x
norm(x)
sqrt(7)
norm(ones(7,1))
error
residual
norm(error)
norm(residual)
norm(x,1)
norm(x,inf)
norm(error,1)
norm(residual,1)
norm(residual)
norm(error)
cond(A)