This function checks that the cost function is correctly specified in the
optimization object, including that the elements of `this`

used by the
cost function are consistent.

1 | ```
optimbase.checkcostfun(this = NULL)
``` |

`this` |
An optimization object |

Depending on the definition of nonlinear constraints (`nbineqconst`

element > 0) and the use of derivatives (`withderivatives`

element set to
TRUE), this function makes several cost function calls with different
`index`

value (see `vignette('optimbase',package='optimbase')`

for
more details about `index`

). If at least one call fails, the function
stops the search algorithm.

Following every successful cost function call, `optimbase.checkcostfun`

calls `optimbase.checkshape`

to check the dimensions of the matrix
returned by the cost function against some expectations.

Return the optimization object or an error message if one check is not successful.

Author of Scilab optimbase module: Michael Baudin (INRIA - Digiteo)

Author of R adaptation: Sebastien Bihorel (sb.pmlab@gmail.com)

`optimbase.checkshape`

Questions? Problems? Suggestions? Tweet to @rdrrHQ or email at ian@mutexlabs.com.

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