# diffbifn Class Reference

Class representing a differentiable function of two variables . More...

`#include <libFN.h>`

Inheritance diagram for diffbifn:

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Collaboration diagram for diffbifn:

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List of all members.

## Public Member Functions
vec | eval (const vec &cond)
| Evaluates (VS: Do we really need common eval? ).
virtual vec | eval (const vec &x0, const vec &u0)
| Evaluates .
virtual void | dfdx_cond (const vec &x0, const vec &u0, mat &A, bool full=true)
| Evaluates and writes result into `A` .
virtual void | dfdu_cond (const vec &x0, const vec &u0, mat &A, bool full=true)
| Evaluates and writes result into `A` .
| diffbifn (int dimy, const RV rvx0, const RV rvu0)
| Default constructor (dimy is not set!).
int | _dimx () const
| access function
int | _dimu () const
| access function
int | _dimy () const
| access function
## Protected Attributes
RV | rvx
| Indentifier of the first rv.
RV | rvu
| Indentifier of the second rv.
int | dimx
| cache for rvx.count()
int | dimu
| cache for rvu.count()
int | dimy
| Length of the output vector.

## Detailed Description

Class representing a differentiable function of two variables .

Function of two variables.

TODO: 1) Technically, it could have a common parent (e.g. `fnc` ) with other functions. For now, we keep it as it is. 2) It could be generalized into multivariate form, (which was original meaning of `fnc` ).

## Member Function Documentation

virtual void diffbifn::dfdx_cond | ( | const vec & | x0,
|  | const vec & | u0,
|  | mat & | A,
|  | bool | full = `true` |
| ) |  |  | `[inline, virtual]`

Evaluates and writes result into `A` .

Parameters:

  | full | denotes that even unchanged entries are to be rewritten. When, false only the changed elements are computed.
  | x0 | numeric value of ,
  | u0 | numeric value of
  | A | a place where the result will be stored.

Reimplemented in bilinfn, IMpmsm, and OMpmsm.

Referenced by EKF< sq_T >::bayes(), EKFCh::bayes(), EKFfull::bayes(), EKF< sq_T >::set_parameters(), EKFCh::set_parameters(), and EKFfull::set_parameters().

virtual void diffbifn::dfdu_cond | ( | const vec & | x0,
|  | const vec & | u0,
|  | mat & | A,
|  | bool | full = `true` |
| ) |  |  | `[inline, virtual]`

Evaluates and writes result into `A` .

Parameters:

  | full | denotes that even unchanged entries are to be rewritten. When, false only the changed elements are computed.
  | x0 | numeric value of ,
  | u0 | numeric value of
  | A | a place where the result will be stored.

Reimplemented in bilinfn, and IMpmsm.

The documentation for this class was generated from the following file:

- work/mixpp/bdm/stat/libFN.h