Dear Expert I want to transform the below timeseries code in a Random walk and then use the detrended fluctuation analysis in MATLAB .Do you know how do I do this?

Below is the program of the time series . % Import the text from the file "Taking Responsibility for Your Own Actions pdf.docx" filename = "Taking Responsibility for Your Own Actions pdf.docx"; str = extractFileText(filename); % Preprocess the text by removing punctuation and converting all characters to lowercase str1 = erasePunctuation(str); % Split the text into individual words str2=split(str); % Map each word to its corresponding index of length len_str=zeros(1,length(str2)); for i=1:length(str2) len_str(i) = strlength(str2(i)); end

plot(len_str) title('Time Series Plot (Number of Letters against Position of Words)') xlabel('Position of words') ylabel('Number of letters') grid on