def vminus(vin):
    """
    Negate a double precision 3-dimensional vector.

    http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vminus_c.html

    :param vin: Vector to be negated. 
    :type vin: 3-Element Array of floats
    :return: Negated vector -v1.
    :rtype: 3-Element Array of floats
    """
    vin = stypes.toDoubleVector(vin)
    vout = stypes.emptyDoubleVector(3)
    libspice.vminus_c(vin, vout)
    return stypes.cVectorToPython(vout)
Negate a double precision 3-dimensional vector.

    http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vminus_c.html

    :param vin: Vector to be negated. 
    :type vin: 3-Element Array of floats
    :return: Negated vector -v1.
    :rtype: 3-Element Array of floats