finding all the maximum/minimum and their corresponding x values

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Eliraz Nahum 2018-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/420537-finding-all-the-maximum-minimum-and-their-corresponding-x-values

回答： Image Analyst 2018-9-24

hello I want to know how I can find all the max values (even if there are many same maximums, like [1 2 3 6 6 6]) of a vector and not only the maximum value found in the vector. I also want to find the corresponding x_values in another vector that relate to the maximum/minimum values found earlier in y_values. I know that there is an option to use: xmin=x(y==Ymin), but which point in the 2D space I will get out of the numerous existing.

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Answer 1

Image Analyst 2018-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/420537-finding-all-the-maximum-minimum-and-their-corresponding-x-values#answer_338197

在 MATLAB Online 中打开

Try this

maxY = max(y);
% Find all locations
indexesOfMax = find(y == maxY)
% Find x values at corresponding locations:
xAtMaxima = x(indexesOfMax)

Not sure what you're talking about with 2-D space. This makes no sense to me: "which point in the 2D space I will get out of the numerous existing" A vector is a 1-D situation, not a 2-D situation, even if it's a curve of y vs. x.