From 99f1612562e6c598dbd2b7841eea074c396562dd Mon Sep 17 00:00:00 2001
From: John Kerl <kerl.john.r@gmail.com>
Date: Sun, 19 Jun 2022 23:48:51 -0400
Subject: [PATCH] split out #168 to make this PR smaller

---
 apis/python/src/tiledbsc/assay_matrix.py | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/apis/python/src/tiledbsc/assay_matrix.py b/apis/python/src/tiledbsc/assay_matrix.py
index d2636f42e5..a018edaf2d 100644
--- a/apis/python/src/tiledbsc/assay_matrix.py
+++ b/apis/python/src/tiledbsc/assay_matrix.py
@@ -597,9 +597,19 @@ def to_csr_matrix(self, row_labels, col_labels):
             s = util.get_start_stamp()
             print(f"{self._indent}START  read {self.uri}")
 
-        csr = self.csr()
+        df = self.df()
+
+        retval = util.X_and_ids_to_sparse_matrix(
+            df,
+            self.row_dim_name,
+            self.col_dim_name,
+            self.attr_name,
+            row_labels,
+            col_labels,
+            return_as="csr",
+        )
 
         if self._verbose:
             print(util.format_elapsed(s, f"{self._indent}FINISH read {self.uri}"))
 
-        return csr
+        return retval