From 7eb00a8d2a029404951a5c8b088be0a83faa91c4 Mon Sep 17 00:00:00 2001
From: Eli Rykoff <erykoff@stanford.edu>
Date: Fri, 27 Sep 2024 11:09:24 -0700
Subject: [PATCH] The post-linear fit should use the linear fit parameters as
 starting values.

This makes sure that when using the photodiode (much larger scaling) that
things converge correctly when checking residuals.
---
 python/lsst/cp/pipe/cpLinearitySolve.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/lsst/cp/pipe/cpLinearitySolve.py b/python/lsst/cp/pipe/cpLinearitySolve.py
index 1bdd35a1..566cc4d9 100644
--- a/python/lsst/cp/pipe/cpLinearitySolve.py
+++ b/python/lsst/cp/pipe/cpLinearitySolve.py
@@ -685,7 +685,7 @@ def run(self, inputPtc, dummy, camera, inputDims,
                 residuals = np.full_like(linearizeModel, np.nan)
             else:
                 postLinearFit, _, _, _ = irlsFit(
-                    [0.0, 100.0],
+                    linearFit,
                     inputAbscissa[mask],
                     linearizeModel[mask],
                     funcPolynomial,