Function calc_power_flow_jacobian 

pub fn calc_power_flow_jacobian(
    instance: &AcPfInstance,
    point: &OperatingPoint<BalancedNetwork>,
    coordinates: VoltageCoordinates,
) -> Result<PowerFlowJacobian, Error>

Compute the sparse physical AC power flow Jacobian for instance at point.

Errors

An operating point that does not share the instance’s network identities or does not state bus voltage magnitudes and angles; an admittance build failure (a zero impedance branch is refused, never skipped).