Incorrect number or types of inputs or outputs for function perturb.

Question

Kel 2024-5-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2114716-incorrect-number-or-types-of-inputs-or-outputs-for-function-perturb

回答： Poorna 2024-5-16

n = 100;
A = rand(n);
AInv = inv(A);
x = ones(n, 1);
b = A * x;
bTilde = perturb(b, 1e-10);
Incorrect number or types of inputs or outputs for function perturb.
xApp = A\b;
xTildeApp = A\bTilde;
disp('x minus xTilde')
xdiff = norm(xApp-xTildeApp)/norm(xApp);
disp('b minus bTilde')
bDiff = norm(b-bTilde)/norm(b);
disp('estimate')
normA = norm(A);
normAInv = norm(AInv);
estimate = normA*normAInv*bDiff

What's wrong with perturb function input?

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Answer 1

Poorna 2024-5-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2114716-incorrect-number-or-types-of-inputs-or-outputs-for-function-perturb#answer_1458766

Hi Kel,

How did come to know of the "perturb" function that you used? As far as I know, there is no "perturb" function to perturb a matrix. However there are "perturb" functions within different toolboxes that accepts different kinds of inputs. Two of them are listed below:

https://www.mathworks.com/help/fusion/ref/inssensor.perturb.html

https://www.mathworks.com/help/aerotbx/ug/inssensor.perturb.html

For your use case, you could manually create a perturbation matrix and add it to the input to create a perturbed matrix.

Hope this Helps!