/* * call-seq: * dvector.acos! -> dvector * * Replace each entry x of _dvector_ with acos(x). * * a = Dvector[ 0.1, -0.2, 0.3 ] * a.acos! -> Dvector[ acos(0.1), acos(-0.2), acos(0.3) ] * a -> Dvector[ acos(0.1), acos(-0.2), acos(0.3) ] */ VALUE dvector_acos_bang(VALUE ary) {