gnuplot – A Picture Says More Than 1000 Numbers …
summary
Demonstrates concrete gnuplot workflows for fetching fuel‑price HTML from spritpreis‑monitor.de, parsing it into CSV, and using set timefmt to parse times. Shows plotting about 650 gas stations (~6,000 measurements) to reveal nightly price shifts, choosing lines vs steps (and why steps can mislead), using column selection, filters and arithmetic expressions, and producing scripted, reproducible outputs (PDF/PS/PNG and reusable savefiles); also notes the change in gnuplot v5 color sequence.
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chapters (9)
- 0:00Introduction to gnuplot
- 12:27Installing gnuplot
- 23:23First steps
- 36:59Plotting data files
- 50:13Advanced data processing
- 1:05:23Exporting graphics
- 1:27:313D plots and analysis
- 1:46:44Practical tips
- 2:00:50Summary and Q&A
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