MATLAB: Sorting a time series

MATLABsort

Hello,

II have a time series Yt and I sorted them in ascending order and I got Yi, then I used them in a function and I got Zi as Zi=F(Yi), How can I rearrange Zi to Zt (the same order of Yt)?

Best Answer

You need to use the optional output from the sort function that contains the sort order.

[Y, idx] = sort(time_series);
Zt = Zi(idx);

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MATLAB: Error: Sample points must be unique and sorted in ascending order.

You can use unique() to get rid of duplicate sample points. It will also sort them.

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As Johannes pointed out, you forgot to output the time (and calculate it, too, for that matter... :) )

...
t=0.0;          % initialize the time value
for i=1:12
  t=t+dt;       % update time
  ...
  fprintf(1, '\t%d\t%06f\t%12.5E\t%.2f\n\n', [t, xi, yi, zi]);  % don't need to build data explicitly
end

Best Answer

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MATLAB: Error: Sample points must be unique and sorted in ascending order.

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