public Vector4f subtract(float subtractX, float subtractY, float subtractZ, float subtractW) {
        return new Vector4f(x - subtractX, y - subtractY, z - subtractZ, w - subtractW);
    }
<code>subtract</code> subtracts the provided values from this vector,
creating a new vector that is then returned.

@param subtractX
           the x value to subtract.
@param subtractY
           the y value to subtract.
@param subtractZ
           the z value to subtract.
@param subtractW
           the w value to subtract.
@return the result vector.
jme3-core/src/main/java/com/jme3/math/Vector4f.java