pub unsafe extern "C" fn mxv_c(
m1: *mut [ConstSpiceDouble; 3],
vin: *mut ConstSpiceDouble,
vout: *mut SpiceDouble,
)pub unsafe extern "C" fn mxv_c(
m1: *mut [ConstSpiceDouble; 3],
vin: *mut ConstSpiceDouble,
vout: *mut SpiceDouble,
)