normex.m

这是matlab宝典里面的源代码 相信对于开发着有所帮助

%输入向量
x=[1:6];
y=x.^2;
%使用定义求解各阶范数
N2=sqrt(sum(y));
Ninf=max(abs(x));
Nvinf=min(abs(x));
%使用norm命令求解范数
n2=norm(x);
ninf=norm(x,inf);
nvinf=norm(x,-inf);
%输出求解的结果
disp('The method of definition:')
fprintf('The 2-norm is %6.4f\n',N2)
fprintf('The inf-norm is %6.4f\n',Ninf)
fprintf('The minusinf-norm is %6.4f\n',Nvinf)
fprintf('\n//-------------------------------//\n\n')
disp('The method of norm command:')
fprintf('The 2-norm is %6.4f\n',n2)
fprintf('The inf-norm is %6.4f\n',ninf)
fprintf('The minusinf-norm is %6.4f\n',nvinf)