L1 and l2 norm

Question

hasan alhussaini 2018-3-14

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388316-l1-and-l2-norm

回答： JMW 2019-11-12

i'm trying to find the code not the function to implement L1 and L2 norm.

I'm trying to compute the L1 and L2 norm of pixels in a image to see the difference between them.

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Answer 1

Johnathan Schaff 2018-3-15

4
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388316-l1-and-l2-norm#answer_310087

编辑：Johnathan Schaff 2018-3-15

在 MATLAB Online 中打开

Reference https://www.mathworks.com/help/matlab/ref/norm.html#bt0y64b-5

%Matrix Norm for Matrix A
%L1 Norm
l1 = max(sum(abs(A)));
matL1 = norm(A,1);
%L2 Norm
l2 = max(svd(A));
matL2 = norm(A,2);
%Comparison
fprintf('L1 Norm | %g\nMATLAB L1 Norm | %g\n',l1,matL1);
fprintf('L2 Norm | %g\nMATLAB L2 Norm | %g\n',l2,matL2);
%Vector Norm for Vector B
%L1 Norm
l1 = (sum(abs(B)));
matL1 = norm(B,1);
%L2 Norm
l2 = sqrt(sum(abs(B).^2));
matL2 = norm(B,2);
%Comparison
fprintf('\nL1 Norm | %g\nMATLAB L1 Norm | %g\n',l1,matL1);
fprintf('L2 Norm | %g\nMATLAB L2 Norm | %g\n',l2,matL2);