Function jacobian_compiled_indexed 

pub fn jacobian_compiled_indexed(
    cg: &CompiledGraph,
    node_params: &[Vec<f64>],
    x: &[f64],
) -> Result<DMatrix<f64>, CoreError>

Compute the analytical Jacobian using pre-computed per-node param buffers.

Hot-path companion to jacobian_compiled: the caller maintains node_params[i] and passes it directly, bypassing all HashMap lookups.

Errors

Returns CoreError::Eval if: x.len() is not an exact multiple of the graph’s coordinate dimensionality (GraphError::XBufferStrideMismatch); the graph’s nodes disagree on n_dims (GraphError::DimensionalityMismatch); or, when multi-dataset scoping is active, a node’s dataset_index is out of range (GraphError::DatasetIndexOutOfRange).