From 8ac0fe272b7c15ace8a21eb9d8ed5ae9a5f035b9 Mon Sep 17 00:00:00 2001
From: Alexey Pechnikov <pechnikov@mobigroup.ru>
Date: Mon, 10 Jun 2024 18:07:32 +0700
Subject: [PATCH] Fix for the previous commit

---
 pygmtsar/pygmtsar/Stack_stl.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pygmtsar/pygmtsar/Stack_stl.py b/pygmtsar/pygmtsar/Stack_stl.py
index 3a8425ff..35a76340 100644
--- a/pygmtsar/pygmtsar/Stack_stl.py
+++ b/pygmtsar/pygmtsar/Stack_stl.py
@@ -13,6 +13,7 @@
 class Stack_stl(Stack_tidal):
 
     def velocity(self, data):
+        import numpy as np
         print('NOTE: Velocity calculation is changed to use least squares linear fit and can produce different results.')
         #years = ((data.date.max() - data.date.min()).dt.days/365.25).item()
         #nanoseconds = (data.date.max().astype(int) - data.date.min().astype(int)).item()