function scale( alpha, z ) {
	return new Complex128( real( z ) * alpha, imag( z ) * alpha );
}
Scales a double-precision complex floating-point number by a real-valued double-precision floating-point scalar constant.

@param {number} alpha - scalar constant
@param {Complex128} z - complex number
@returns {Complex128} result

@example
var Complex128 = require( '@stdlib/complex/float64/ctor' );

var z = new Complex128( 5.0, 3.0 );

var out = scale( 5.0, z );
// returns <Complex128>[ 25.0, 15.0 ]