jacobian-rows
Four numbers, and the sign of each of them
The two Jacobian rows for a coupler point attached at u = 0.55, v = 0.85, against a central difference of the residual they differentiate. The corrected rows agree everywhere. The pre-correction rows differ in exactly 4 places, and in every one of them the difference is a sign. At v = 0 all twelve entries agree, which is why nothing noticed.
Where it is used
- Two routes to a sensitivity As built
- The solver was refusing a quarter of the sweep Drawn wrongly
- Two routes to a Jacobian One path to the tool
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