From 2c5550601b18849a6efcdc5f32d18577b7852634 Mon Sep 17 00:00:00 2001
From: jameswillis <james@wherobots.com>
Date: Fri, 2 Aug 2024 14:30:28 -0700
Subject: [PATCH] make matplotlib optional

---
 README.md     | 1 +
 esda/moran.py | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 99837b95..98d80e17 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ $ pip install git+https://github.com/pysal/esda@main
 
 - `numba>=0.57` - used to accelerate computational geometry and permutation-based statistical inference.
 - `rtree>=1.0` - required for `esda.topo.isolation()`
+- `matplotlib` - required for `esda.moran.explore()`
 
 ## Contribute
 
diff --git a/esda/moran.py b/esda/moran.py
index 79a32c6b..64090c5d 100644
--- a/esda/moran.py
+++ b/esda/moran.py
@@ -16,7 +16,6 @@
 import scipy.stats as stats
 from libpysal.weights import W
 from libpysal.weights.spatial_lag import lag_spatial
-from matplotlib import colors
 from scipy import sparse
 
 from .crand import _prepare_univariate
@@ -1786,6 +1785,11 @@ def _explore_local_moran(moran_local, gdf, crit_value, **kwargs):
         folium.Map
     """
 
+    try:
+        from matplotlib import colors
+    except ImportError:
+        raise ImportError("matplotlib library must be installed to use the explore feature") from None
+
     gdf = gdf.copy()
     gdf["Moran Cluster"] = moran_local.get_cluster_labels(crit_value)
     gdf["p-value"] = moran_local.p_sim