optimization_variable

• type: setup command.
• function: defines a parameter of an element to be used in optimization.

&optimization_variable
    STRING name = NULL;
    STRING item = NULL;
    double lower_limit = 0;
    double upper_limit = 0;
    double step_size = 1;
&end

• name -- The name of the element.
• item -- The parameter of the element to be varied.
• lower_limit, upper_limit -- The lower and upper limits allowed for the parameter. If these are equal, the range of the parameter is unlimited.
• step_size -- The initial step size (``simplex'' optimization ) or the grid size in this dimension (``grid'' or ``sample'' optimization).