For loop on .txt serie

I have a time serie mySerie.txt (1000x1). I need to evaluate a function on consecutive subseries with increase in length, from 350 points up to 750 points. Example: starting from latest 350 points (from 651 : 1000, first serie) I have to apply myFunction and get a result,then do the same but this time on data from 650:1000, and again from 649 : 1000 and so on up to the last iteration on 251:1000.These are 750 iterations and I will get 750 result from myFunction, saved in an array or vector in order to be plotted.Thanks for any help.

Answer 1

[BhaTTa]

To evaluate a function on consecutive subseries with increasing lengths from a time series and collect the results for plotting, you can follow these steps in MATLAB:

1. Load the time series data from the file.
2. Define the range of subseries lengths you want to analyze.
3. Iterate over the time series to extract the subseries and apply the function.
4. Store the results in an array.
5. Plot the results.

Here's a MATLAB script that accomplishes this:

% Step 1: Load the time series data
mySerie = load('mySerie.txt'); % Adjust the file path if needed
n = length(mySerie);

% Define the range of subseries lengths
minLength = 350; % Starting length
maxLength = 750; % Ending length

% Initialize an array to store the results
results = zeros(maxLength - minLength + 1, 1);

% Define your function handle (replace this with your actual function)
myFunction = @(data) mean(data); % Example function: mean of the subseries

% Iterate over the time series to extract subseries and apply the function
for length = minLength:maxLength
    % Compute the starting index of the subseries
    startIdx = n - length + 1;
    
    % Extract the subseries
    subSeries = mySerie(startIdx:end);
    
    % Apply the function and store the result
    results(length - minLength + 1) = myFunction(subSeries);
end

% Create an array of subseries lengths for plotting
lengths = minLength:maxLength;

% Plot the results
figure;
plot(lengths, results, '-o');
xlabel('Subseries Length');
ylabel('Function Result');
title('Function Results for Increasing Subseries Lengths');
grid on;