Find min values in sequence time series

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dau 2018-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/427003-find-min-values-in-sequence-time-series

评论： dau 2018-10-31

Dear all I like to ask your help for this Matlab function to find mean value of a sequence dataset as demonstrated in Figure below.

Column 5 is min of a range values in column 3 based on column 4 (with fd =1).

Thank you very much

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Answer 1

KSSV 2018-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/427003-find-min-values-in-sequence-time-series#answer_344304

在 MATLAB Online 中打开

As the data is not given, I have created some random data...check the code:

v = [1 2 3 0 0 0 0 0 2 3 4 0 0 0 0 0 4 5 6 7 0 0 0 0 1 1 1]';
A = rand(27,4) ;
A(:,4) = v ;
w = [false; v~=0 ;false]; 
starts = find(w(2:end) & ~w(1:end-1)); %Get starts of runs of non-zeros
ends = find(~w(2:end) & w(1:end-1))-1; % Get ends of runs of non-zeros
result = arrayfun(@(s,e) A(s:e,1:3), starts, ends, 'uniformout', false); % extract the respective parts 
iwant = cellfun(@mean,result,'uniformout',false)

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dau 2018-10-31

编辑：dau 2018-10-31

Thank you very much for your code. It worked for me now. Again. thank you so much for your kind helps

dau 2018-10-31

Can i ask one more thing, since i want to get min value then i change your expression to:

iwant = cellfun(@min,result,'uniformout',false)

I next step want to divide the iwant to the first column with the same value such as: In the first sequence, the min value equaled -187.1, then next result1 = -187.1 / 421.9 (in the first column). This will repeat to the next sequences, ex: result2 = -596.3 /824.5

Thank you

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