From 9905a9ff160ae4688815640cc4e669c5fdfe3273 Mon Sep 17 00:00:00 2001
From: Arun Isaac
Date: Sat, 6 Sep 2025 14:23:28 +0100
Subject: Construct empty genotype frame using series.

---
 pyhegp/pyhegp.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/pyhegp/pyhegp.py b/pyhegp/pyhegp.py
index 3598931..4e0bd84 100644
--- a/pyhegp/pyhegp.py
+++ b/pyhegp/pyhegp.py
@@ -134,11 +134,8 @@ def cat_genotype(genotypes):
         # If there are no input data frames, return an empty data
         # frame with the chromosome and position columns.
         case []:
-            genotype = pd.DataFrame(data={"chromosome": [],
-                                          "position": []})
-            genotype.chromosome = genotype.chromosome.astype("str")
-            genotype.position = genotype.position.astype("int")
-            return genotype
+            return pd.DataFrame({"chromosome": pd.Series(dtype="str"),
+                                 "position": pd.Series(dtype="int")})
         case _:
             return reduce(cat2, genotypes)
 
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cgit 1.4.1