20818: back conversion in py_asinh incomplete

sagemath · Jun 12, 2016 · 4df530d · 4df530d
1 parent 715566f
commit 4df530d
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diff --git a/src/sage/functions/hyperbolic.py b/src/sage/functions/hyperbolic.py
@@ -676,6 +676,13 @@ def __init__(self):
             -1/(sqrt(x^2 + 1)*x)
             sage: latex(arccsch(x))
             \operatorname{arccsch}\left(x\right)
+
+        TESTS:
+
+        Check if :trac:`20818` is fixed::
+
+            sage: arccsch(float(0.1))
+            2.99822295029797
         """
         GinacFunction.__init__(self, "arccsch",
                 latex_name=r"\operatorname{arccsch}",

diff --git a/src/sage/symbolic/pynac.pyx b/src/sage/symbolic/pynac.pyx
@@ -1770,6 +1770,10 @@ cdef object py_asinh(object x) except +:
     try:
         return x.arcsinh()
     except AttributeError:
+        pass
+    try:
+        return RR(x).arcsinh()
+    except TypeError:
         return CC(x).arcsinh()
 
 cdef object py_acosh(object x) except +: