Find the corresponding value of y when x is a specific value?

Question

Cheuk Yin Wong 2022-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/1722515-find-the-corresponding-value-of-y-when-x-is-a-specific-value

编辑： Voss 2022-5-19

I have a 369 x 2 x 27 matrix. The 369 rows (x value) are from 230:598. I want to find the corresponding y value when x-value is equal 280. Then, make a table with 1:27 on the first column and the corresponding values as the second column. Can anyone please advice me how to do it?

Thank you so much!!

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Answer 1

Voss 2022-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/1722515-find-the-corresponding-value-of-y-when-x-is-a-specific-value#answer_966840

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Maybe this

% a 3D array like yours
M = [(230:598).' rand(369,1)]+reshape(0:5:130,[1 1 27]);
size(M)
ans = 1×3
   369     2    27
% find the row of M(:,1,1) where 280 is
row_idx = find(M(:,1,1) == 280,1);
% make the table
T = table((1:size(M,3)).',permute(M(row_idx,2,:),[3 2 1]));
head(T)
ans = 8×2 table
    Var1     Var2 
    ____    ______

     1      0.6688
     2      5.6688
     3      10.669
     4      15.669
     5      20.669
     6      25.669
     7      30.669
     8      35.669