Optimization problem with quadratic function

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laura bagnale 2021-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/853200-optimization-problem-with-quadratic-function

评论： Matt J 2021-6-11

采纳的回答： Matt J

Hello everyone,

I hope someone could help me. This is the problem:

I have 12 points which are experimental measures, represented by 3 independent variables (x,y,z) and the fourth one that represents the density and it depends from the others: w= f(x,y,z). I need to:

-plot the data,

-obtain the quadratic fit function w, i.e. the function that describes the density,

-represent the isosurfaces where w is constant.

- Finally I need to minimize this quadratic function with no constraints.

Starting from

x = rand(12, 1);

y = rand(12, 1);

z = rand(12, 1);

w = rand(12, 1);

I found the quadratic function but I'm not sure how to represent the values of f(x,y,z) like isosurfaces and how to minimize it.

Thanks a lot!

Laura

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采纳的回答

Matt J 2021-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/853200-optimization-problem-with-quadratic-function#answer_721955

You can use isosurface() to plot and quadprog() to minimize.

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laura bagnale 2021-6-11

Thanks a lot for your help and support!!

That was helpful!

Kind Regards,

Laura

Matt J 2021-6-11

I'm glad, but please Accept-click the answer if the your question is now resolved.

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Mathematics and Optimization Optimization Toolbox Least Squares Linear Least Squares

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