optimization_covariable

• type: setup command.
• function: define an element parameter to be varied as a function of optimization parameters.

&optimization_covariable
    STRING name = NULL;
    STRING item = NULL;
    STRING equation = NULL;
    long disable = 0;
&end

• name -- The name of the element.
• item -- The parameter of the element to be changed.
• equation -- An rpn equation for the value of the parameter in terms of the values of any parameters of any optimization variable. These latter appear in the equation in the form <element-name>.<parameter-name>, in all capital letters.
• disable -- If nonzero, the covariable is ignored.