&optimization_covariable STRING name = NULL; STRING item = NULL; STRING equation = NULL; &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.