From f1430f5cbbc13e0d74a5b1e7ac14b908d9f8d97b Mon Sep 17 00:00:00 2001
From: Volker Bergen <31883718+VolkerBergen@users.noreply.github.com>
Date: Tue, 25 Jun 2019 17:33:53 +0200
Subject: [PATCH] allow negative values in sparse data

`layers[''].sparse()` would detach all negative values due to `val > 0` in line 123.
---
 loompy/loom_layer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/loompy/loom_layer.py b/loompy/loom_layer.py
index c2f433a..7194582 100644
--- a/loompy/loom_layer.py
+++ b/loompy/loom_layer.py
@@ -120,7 +120,7 @@ def sparse(self, rows: np.ndarray = None, cols: np.ndarray = None) -> scipy.spar
 				vals = view.layers[self.name][rows, :]
 			else:
 				vals = view.layers[self.name][:, :]
-			nonzeros = np.where(vals > 0)
+			nonzeros = np.where(vals != 0)
 			data.append(vals[nonzeros])
 			row.append(nonzeros[0])
 			col.append(nonzeros[1] + i)