@spiceErrorCheck<EOL>def dvdot(s1, s2):
assert len(s1) is <NUM_LIT:6> and len(s2) is <NUM_LIT:6><EOL>s1 = stypes.toDoubleVector(s1)<EOL>s2 = stypes.toDoubleVector(s2)<EOL>return libspice.dvdot_c(s1, s2)<EOL>
Compute the derivative of the dot product of two double
precision position vectors.

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

:param s1: First state vector in the dot product.
:type s1: 6-Element Array of floats
:param s2: Second state vector in the dot product.
:type s2: 6-Element Array of floats
:return: The derivative of the dot product.
:rtype: float