/* * call-seq: * dvector.atanh! -> dvector * * Replace each entry x of _dvector_ with atanh(x). * * a = Dvector[ 1.1, -2.2, 5.3 ] * a.atanh! -> Dvector[ atanh(1.1), atanh(-2.2), atanh(5.3) ] * a -> Dvector[ atanh(1.1), atanh(-2.2), atanh(5.3) ] */ VALUE dvector_atanh_bang(VALUE ary) {