Have Frame implement Default

[gwbres]

Effects

If this is a new feature or a bug fix ...

• [ ] Yes, the branch I'm proposing to merge is called issue-xyz where xyz is the number of the issue.

If this change adds or modifies a validation case

• [x] No.
• [ ] Yes and:
  • I have coded up, or updated, an existing test case; and
  • I have provided a GMAT script which confirms the result(s); and
  • I have updated the VALIDATION.md file with the new error data between nyx and GMAT.
  • I will specify the version of GMAT used for the validation.

[ChristopherRabotin]

In what cases do you need a default for Frame? Is it to create a default orbit?

The issue is that the frame contains the gravity information for the central object of the orbit, along with flattening values, and the "paths" in the ephemeris file. All of this will be made obsolete when I get ANISE working and integrated in Nyx in the next few weeks hopefully.

[gwbres]

Hello @ChristopherRabotin,

In what cases do you need a default for Frame? Is it to create a default orbit?

My use case is, when parsing files that describe several possible Reference Frames, like ITRF08, ITRF15... is how to provide a default case and avoid a panic!. Does that make sense ?

[ChristopherRabotin]

I understand. The function should return an error if that frame does not exist because if it doesn't stop at initialization, it will panic later if the frame information is needed for any computations.

[ChristopherRabotin]

I'll close this for now but we can revisit this after #86 .

[gwbres]

Hello @ChristopherRabotin,

the function should return an error if that frame does not exist because if it doesn't stop at initialization, it will panic later if the frame information is needed for any computations

That make a lot more sense than my initial plan.