optimize
========
```{function}  optimize( optimdir, params, options, algorithm )
```
Full definition:
```{code-block} matlab
params = optimize( optimdir, params, options, algorithm )
```

input:
- optimdir:   folder where to optimize
- params:     array of structures with parameters to optimize
  - .name -     char string - parameter name (e.g. 'length1')
  - .value -    number  
  - .step -     number      - discretization of .value
  - .range -    row vector  - range of .value (e.g. [1 10])
  - .active -   (0/1)       - 1=optimize this parameter
- options:    structure
  - .folder_matlabstart:  set the startup folder for matlab or octave
  - .simfun:              char string with the simulation function name
  - .octave_exe:          if this field is present, octave is used
  - .clean:               clean the optimization folder before optimization start
- algorithm:  'asco' or 'simplex-downhill'
  
output:
- params: optimal values
- result: optimization criterion for optimal values

example:
  see openEMS/matlab/examples/optimizer

notes:
  Create a file named 'STOP_OPTIMIZATION' in the optimdir folder to stop
  the optimization process (or press Ctrl+C).

(C) 2010 Sebastian Held <sebastian.held@gmx.de>