find a row number in text file for certain condition

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sermet OGUTCU 2021-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/813565-find-a-row-number-in-text-file-for-certain-condition

评论： Jan 2021-4-26

data=[1.2;1.0;0.05;0.4;0.3;0.2;0.1;0.05;0.04;0.03;0.03;0.02;0.01;0.001;0.01;0.01;0.001 ] ;

Here, the answer to my problem is 8th row, because the 10 consecutive rows from the 8th row are smaller than 0.10. How can I write a code to determine the row number which satisfies this condition?

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Jan 2021-4-26

编辑：Jan 2021-4-26

Why do you menation a text file?

sermet OGUTCU 2021-4-26

The text file includes the numeric data as n (row) x 1 (column)

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Answer 1

Jan 2021-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/813565-find-a-row-number-in-text-file-for-certain-condition#answer_685145

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data = [1.2;1.0;0.05;0.4;0.3;0.2;0.1;0.05;0.04;0.03;0.03;0.02;0.01;0.001;0.01;0.01;0.001 ] ;
[b, n, index] = RunLength(data < 0.1);
match = find(b & n >= 10, 1);
result = index(match)
result = 8
function [b, n, index] = RunLength(x)
d = [true; diff(x(:)) ~= 0];  % TRUE if values change
b = x(d);                     % Elements without repetitions
k = find([d.', true]);        % Indices of changes
n = diff(k);                  % Number of repetitions
index = k(1:numel(k) - 1);
if iscolumn(x)
    n     = n.';
    index = index.';
end
end