function zdscal( N, da, zx, strideZX ) {
	return ndarray( N, da, zx, strideZX, stride2offset( N, strideZX ) );
}
Scales a double-precision complex floating-point vector by a double-precision floating-point constant.

@param {PositiveInteger} N - number of indexed elements
@param {number} da - constant
@param {Complex128Array} zx - input array
@param {integer} strideZX - `zx` stride length
@returns {Complex128Array} input array

@example
var Complex128Array = require( '@stdlib/array/complex128' );

var zx = new Complex128Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );

zdscal( 3, 2.0, zx, 1 );
// zx => <Complex128Array>[ 2.0, 4.0, 6.0, 8.0, 10.0, 12.0 ]