Errors in PKEPLER,SGP4: How to resolve the following errors relating to the mu program file, a MATLAB system file

The rvcoe function which is linked to the pkepler file, contains a declaration muin =mu, and I suspect this mu has been confused with the mu system file. How to resolve this error?

[Walter Roberson]

Is that code intended to use pkepler from https://celestrak.com/software/vallado-sw.asp ?

[KSSV]

What is this function pkelpler ? It is not inbuilt function....

[Aswath Surya]

Yes, the code intended to use pkepler from the the same URL. pkepler is a function from the astrodynamics software package (from celestrak, by D Vallado)

Answer 1

[Walter Roberson]

rv2coe invokes the script constastro.m . As of 2007, constastro defines

mu         = 398600.4418;

If you are using an older version that does not assign a value to mu, then you could end up accidentally invoking the obsolete function mu from the Robust Control toolbox.