cylinder.py [71b751d:ee60aa7] in sasmodels

File:

sasmodels/models/cylinder.py

-                      r71b751d
+                      ree60aa7
 source = ["lib/polevl.c", "lib/sas_J1.c", "lib/gauss76.c", "cylinder.c"]
 have_Fq = True
+def ER(radius, length):
+    """
+        Return equivalent radius (ER)
+    """
+    ddd = 0.75 * radius * (2 * radius * length + (length + radius) * (length + pi * radius))
+    return 0.5 * (ddd) ** (1. / 3.)
+effective_radius_type = [
+    "equivalent sphere", "radius",
+    "half length", "half min dimension", "half max dimension", "half diagonal",
+    ]
 def random():

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