/* * call-seq: * dvector.cosh -> a_dvector * * Returns of copy of _dvector_ with entry x replaced by cosh(x). * * a = Dvector[ 0.1, -0.2, 0.3 ] * a.cosh -> Dvector[ cosh(0.1), cosh(-0.2), cosh(0.3) ] */ VALUE dvector_cosh(VALUE ary) {