Subtract two values of an array and multiply them by a constant

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Troth 2022-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/1868818-subtract-two-values-of-an-array-and-multiply-them-by-a-constant

评论： Troth 2022-12-1

A = B_Oscilloscope;                                             % Data (1007x94 array)
for k = 1:size(A,2)
    [pks, locs] = findpeaks(A(:,k));
    [~,ix] = sort(pks);
    minpk{:,k} = [pks(ix(1:2)) locs(ix(1:2))];
    maxpk{:,k} = [pks(ix(end-1:end)) locs(ix(end-1:end))];
end
maxpk{1}                                                        % View Result
minpk{1}                                                        % View Result

Hi everyone! Here is my current code:

This creates 2 1x94 arrays with my data (Minimums and Maximums), and each cell contains a 2x2 matrix (second peak and its indice, and first peak and indice). I need to go into each of those matrixes in the arrays and subtract the second entry in the first row by the second entry in the second row, and multiply it by a constant. Similary for both of the arrays I need to subtruct the 1st entry in the minmum row from the 1st in the second, the 2nd entry in the minimum row from the 2nd in the maximum row.

I hope that makes sense.

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Fifteen12 2022-12-1

It might help if you provide an example of what you'd like to do! Is the constant scalar the same for every cell?

Troth 2022-12-1

Yes, the constant scalar is the same

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Answer 1

Fifteen12 2022-12-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1868818-subtract-two-values-of-an-array-and-multiply-them-by-a-constant#answer_1117698

编辑：Fifteen12 2022-12-1

在 MATLAB Online 中打开

If you put everything into an array (rather than a cell array) you can do logial indexing:

rng(1);
constant = 2;
minpk = [randi(10, 2), randi(10, 2), randi(10, 2)]
minpk = 2×6
     5     1     2     2     4     5
     8     4     1     4     6     7
out = constant * (minpk(1, 2:2:length(minpk)) - minpk(2, 2:2:length(minpk)))
out = 1×3
    -6    -4    -4