Hi, welcome. It's not a complicated question, it's an unclear one.

• How do I post a question effectively?
• I know what I mean. Why don't you?
• Short, Self-Contained, Correct Example

• What is a timestep?
• Are the files guaranteed to have synchronized timesteps, or are the lines timestamped?
• What are the rules that define a "cluster"?
• Why do you want separate output files for clusters and cluster sizes? You'll need another script to read that data.

Please supply:

• Data samples with at least 10 - 20 timesteps represented
• ... inside <code></code> tags as shown on the posting form
• The code you have now
• ... and how it does not do what you want (error messages if any)
• A higher-level description of what you plan to do with the output. There may be a better strategy than the one you've developed so far

Make your question clearer and you'll get better answers. Thanks!

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