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I want to do a least squares fit to the values around a matrix diagonal including the diagonal itself.

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Douglas Brenner 2018-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/423131-i-want-to-do-a-least-squares-fit-to-the-values-around-a-matrix-diagonal-including-the-diagonal-itsel

评论： Stephen23 2018-10-10

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Stephen23 2018-10-10

Douglas Brenner's "Answer" moved here:

Actually the post went out prematurely. But it help me get a clearer picture of what I want to do. So let me ask another question. How do I query the values in a matrix surrounding the diagonal? That is for each row and column such that sqrt(p^2 + q^2) < n^2 elements from the diagonal besides a loop.

Walter Roberson 2018-10-10

? You are looking for a quarter-circle centered just outside the upper left corner, with radius n ?

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Stephen23 2018-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/423131-i-want-to-do-a-least-squares-fit-to-the-values-around-a-matrix-diagonal-including-the-diagonal-itsel#answer_340599

"How do I query the values in a matrix surrounding the diagonal?"

https://www.mathworks.com/help/matlab/ref/diag.html

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Stephen23 2018-10-10

Douglas Brenner's "Answer" moved here:

Thanks Steve.

Stephen23 2018-10-10

@Douglas Brenner: please accept my answer if it helped you.

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MATLAB Language Fundamentals Matrices and Arrays Operating on Diagonal Matrices

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