From ec5aafc3eaef858a23c5f9ced094159f31e170f4 Mon Sep 17 00:00:00 2001
From: Ameyanagi <77273474+Ameyanagi@users.noreply.github.com>
Date: Fri, 14 Jul 2023 15:04:13 -0400
Subject: [PATCH] bugfix npad argument for smooth function

---
 larch/math/utils.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/larch/math/utils.py b/larch/math/utils.py
index a0401e177..4706f6d07 100644
--- a/larch/math/utils.py
+++ b/larch/math/utils.py
@@ -296,7 +296,8 @@ def smooth(x, y, sigma=1, gamma=None, xstep=None, npad=None, form='lorentzian'):
         xstep = min(np.diff(x))
     if xstep < TINY:
         raise Warning('Cannot smooth data: must be strictly increasing ')
-    npad = 5
+    if npad is None:
+        npad = 5
     xmin = xstep * int( (min(x) - npad*xstep)/xstep)
     xmax = xstep * int( (max(x) + npad*xstep)/xstep)
     npts1 = 1 + int(abs(xmax-xmin+xstep*0.1)/xstep)