[us-commits] [ehb54/ultrascan3] e2d0c3: extrap_c0: scale the spliced reference for a conti...

[emre brookes]

  Branch: refs/heads/ehb54-issue-920
  Home:   https://github.com/ehb54/ultrascan3
  Commit: e2d0c3b012a50fefb15cc2759bd2284830f4e185
      https://github.com/ehb54/ultrascan3/commit/e2d0c3b012a50fefb15cc2759bd2284830f4e185
  Author: ehb54 <brookes at uthscsa.edu>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M us_somo/develop/src/us_hydrodyn_saxs_iqq_extrap_c0.cpp

  Log Message:
  -----------
  extrap_c0: scale the spliced reference for a continuous merge cutover

The high-q reference splice copied the reference verbatim, but the dilute
extrapolation and the reference generally differ by a few percent at the merge
point (the extrapolation carries the true dilute-limit scale), leaving a visibly
bad step at the cutover (~5% on the alpha-syn test set, obvious near q=0.09).

Scale the spliced reference by the median ratio of the normalized extrapolation
to the normalized reference over a 25-point window just below the merge, so the
reference supplies clean high-q shape stitched smoothly onto the extrapolation
(the way almerge's scaled merge stays continuous). Removes the systematic step,
leaving only noise-level mismatch; the factor is reported in the editor.

Co-Authored-By: Claude Fable 5 <noreply at anthropic.com>



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