How to find Y value that corresponds to the maximum X value in these graphs?

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Ismail Qeshta 2019-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/445675-how-to-find-y-value-that-corresponds-to-the-maximum-x-value-in-these-graphs

关闭： MATLAB Answer Bot 2021-8-20

Hi,

I need to find the Y value that corresponds to the maximum X value for the curves attached herewith.

I tried to use interp1, but I am not sure how to make it for several files.

Can anyone please help me with this?

Thank you.

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Ismail Qeshta 2019-2-19

编辑：Ismail Qeshta 2019-2-19

Hi Bob,

I tried to develop this code, but it does not work.

I get the following error message:

Index in position 1 is invalid. Array indices must be positive integers or logical values.

Error in ResidualDisp (line 10)

maxy = matDrift(max(matDrift(:,1)),2);

clear; clc;
Folder = cd;
N=10;
for k = 1:N;
  Driftt  = sprintf('X%d.out', k);
  matDrift     = importdata(fullfile(Folder, Driftt));
maxy = matDrift(max(matDrift(:,1)),2);
end

Stephen23 2019-2-19

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KSSV 2019-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/445675-how-to-find-y-value-that-corresponds-to-the-maximum-x-value-in-these-graphs#answer_361674

files = dir('*.txt') ;
N = length(files) ;
iwant = zeros(N,2) ;
for i = 1:N
    data = load(files(i).name) ;
    [val,idx] = max(data(:,1)) ;
    iwant(i,:) = [val data(idx,2)] ;
end

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KSSV 2019-2-19

Okay.....try this https://in.mathworks.com/matlabcentral/fileexchange/10959-sort_nat-natural-order-sort to read the file sin order.

Ismail Qeshta 2019-2-19

Hi KSSV,

Thank you for your suggestion.

I am not sure, I have used it as below, but it still does not work.

The updated code:

files = dir('*.out') ;
N = length(files) ;
iwant = zeros(N,2) ;
for i = 1:N
    data = load(files(i).name) ;
    [val,idx] = sort_nat((max(data(:,1))));
    iwant(i,:) =[val data(idx,2)];
end