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