Add hyperbolic functions (#47)

Author: aplavin

Project.toml

@@ -1,6 +1,6 @@
 name = "InverseFunctions"
 uuid = "3587e190-3f89-42d0-90ee-14403ec27112"
-version = "0.1.13"
+version = "0.1.14"
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

src/inverse.jl

@@ -143,6 +143,18 @@ inverse(::typeof(log10)) = exp10
 inverse(::typeof(expm1)) = log1p
 inverse(::typeof(log1p)) = expm1
 
+
+inverse(::typeof(sinh)) = asinh
+inverse(::typeof(tanh)) = atanh
+inverse(::typeof(coth)) = acoth
+inverse(::typeof(csch)) = acsch
+
+inverse(::typeof(asinh)) = sinh
+inverse(::typeof(atanh)) = tanh
+inverse(::typeof(acoth)) = coth
+inverse(::typeof(acsch)) = csch
+
+
 inverse(::typeof(sqrt)) = square
 inverse(::typeof(square)) = sqrt
 

test/test_inverse.jl

@@ -54,13 +54,18 @@ end
     end
     for f in (
             +, -, exp, exp2, exp10, expm1, cbrt, deg2rad, rad2deg, conj,
+            sinh, tanh, coth, csch, asinh, atanh, acsch,  # all invertible hyperbolic functions aside from acoth
             Base.Fix1(+, rand()), Base.Fix2(+, rand()), Base.Fix1(-, rand()), Base.Fix2(-, rand()),
             Base.Fix1(*, rand()), Base.Fix2(*, rand()), Base.Fix1(/, rand()), Base.Fix2(/, rand()), Base.Fix1(\, rand()), Base.Fix2(\, rand()),
             Base.Fix2(^, rand(-11:2:11)),
         )
         InverseFunctions.test_inverse(f, x)
         InverseFunctions.test_inverse(f, -x)
     end
+    # acoth only defined for |x| > 1
+    InverseFunctions.test_inverse(acoth, 1 + x)
+    InverseFunctions.test_inverse(acoth, -1 - x)
+
     InverseFunctions.test_inverse(conj, 2 - 3im)
     InverseFunctions.test_inverse(reverse, [10, 20, 30])