FREE_GPA(1)

📦
version 2026.2 · 4 versions
, in ubuntu resolute, ubuntu stonking

✨ free_gpa — the manual page, but make it make sense ✨

okay bestie, so this is free_gpa from the 2026.2 era and it's literally about to be your new fave little scattering-curve tool 💖 it lives in the User Commands section of the manual (section 1, iykyk) and yeah, the vibe is very "small utility, big brain."

🌸 NAME 🌸

free_gpa — the manual page for free_gpa 2026.2 🎀

💅 DESCRIPTION 💅

okay so here's the tea, the whole entire usage line:

usage: free_gpa [OPTIONS] FILES

and what it DOES is genuinely iconic: it calculates the radius of gyration using Guinier Peak Analysis (that's Putnam 2016, cite her 💜) for a whole set of scattering curves. not one. a set. main character energy fr fr.

🦋 positional arguments 🦋

  • FILE — dat files of the scattering curves. that's it, that's the input. drop your dat files here bestie 📁

✨ options ✨

  • -h, --help — shows this help message and dips out. the classic.
  • -v, --verbose — switches to verbose mode, so it tells you EVERYTHING. no secrets, we love an honest queen 👑
  • -V, --version — shows the program's version number and exits. a lil flex, deserved.
  • -o, --output OUTPUT — output filename. name your baby 💖
  • -f, --format FORMAT — output format, and the options are: native, csv, ssf
  • -u, --unit {nm,??,A} — unit for q: inverse nm or ??ngstrom? 🫠 (yes the ?? is literally in there, it's giving "the author was typing with one hand holding a coffee")
okay so real talk for a sec, because this part matters: free_gpa is an open-source implementation of the autorg algorithm — the one that was originally part of the ATSAS suite. and because this tool used a different theory, some results may differ. so like, don't be shocked if the numbers don't match perfectly. that's not a bug, that's science being science 🧚

🌈 SEE ALSO 🌈

the full documentation for free_gpa is maintained as a Texinfo manual (very demure, very mindful). if the info and free_gpa programs are properly installed at your site, this command

info free_gpa

should give you access to the complete manual. periodt. 💅

okay and the cute lil sign-off: this whole page is free_gpa 2026.2, dated March 2026, and it's the FREE_GPA(1) manual page 🎀 go forth and compute your radius of gyration, bestie, you're gonna slay 🔥⭐💖

📦 where this page comes from