Add Zero Tolerance to Check Partials for Relative Error Checks

[andrewellis55]

Desired capability or behavior.

In some cases, derivatives are very close to 0. This can cause relative error checks to fail. It may be worth to adding a parameter zero_tol to the check_partials call that rounds the calc mag to zero if it is bellow this tolerance before comparing it to the check mag.

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Component: Comp 'comp'
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'<output>'       wrt '<variable>'        | calc mag.  | check mag. | a(cal-chk) | r(cal-chk)
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'a' wrt 'b'  | 1.4410e-17 | 0.0000e+00 | 1.4410e-17 | 1.0000e+00 >REL_TOL

Associated POEM

No response