rxExpandFEta_ function

Expand d(f)/d(eta)

rxExpandFEta_(state, neta, pred, isTheta = FALSE)

Arguments

• state: is the state to expand
• neta: is the number of etas
• pred: type of prediction
• isTheta: logical, is the expansion actually for thetas instead of etas

Returns

String of symengine expressions to evaluate to calculate df/deta