Description Usage Arguments Value Author(s) References

Calculate the Jacobian matrix with the original dataset and the
current version of fitted data. This is not intended for
external use. It is called from `fitConic`

1 | ```
JmatrixLMA(XY, parA, XYproj)
``` |

`XY` |
The original input dataset |

`parA` |
The current set of ABCDEF quadratic equation coefficients. |

`XYproj` |
The current calculated dataset based on the latest iteration of the coefficient set. |

`Res ` |
residuals based on the norm of XY - XYproj |

`J ` |
matrix of values for each input data point corresponding to the terms in the general quadratic Ax^2 + Bxy + Cy^2 +Dx + Ey +F |

Carl Witthoft <carl@witthoft.com>

This is a copy of `JmatrixLMA `

with some
validation steps added.

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