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-rwxr-xr-xpython/slope.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/python/slope.py b/python/slope.py
index 29d967e..03839e5 100755
--- a/python/slope.py
+++ b/python/slope.py
@@ -62,8 +62,8 @@ dzdy = np.zeros((NYCELL, NXCELL))
for i in range(1, NYCELL + 1):
for j in range(1, NXCELL + 1):
dzdy[i-1, j-1] = (z3[i+1, j] - z3[i-1, j])/(2.0*DY)
-# array index and co-ordinates are related by:
-# index = (co-ord - 0.25)*2
+# Note: dz/dy index and co-ordinates are related by:
+# index = int(co-ord/DX - 0.5)
#print("dzdy", dzdy[NYCELL-1, 280:301])
#print("elev", elev[NYCELL-1, 280:301])