Structure-based configuration settings (optim_doc)

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### 10.4 Parameter-related configuration settings in structure form

The vector-based settings `lbound`, `ubound`, `fixed`, `diffp`, `diff_onesided`, `fract_prec`, and `max_fract_change` can be replaced by the setting `param_config`. It is a structure that can contain fields corresponding to parameter names. For each such field, there may be subfields with the same names as the above vector-based settings, but containing a scalar value for the respective parameter.

For example, if the parameters are named `a` and `b`, instead of specifying

    settings = optimset ("lbound", [-Inf; 0],
                         "diff_onesided", [true; true]);

one can specify

    pconf.b.lbound = 0;
    pconf.a.diff_onesided = true;
    pconf.b.diff_onesided = true;
    settings = optimset ("param_config", pconf);

If `param_config` is specified, none of the above vector-based settings may be used.