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The '''FIX''' and '''FREE''' statements are used to constrain (fix) and unconstrain (free) variables. A variable which has been fixed has a known value assigned to it, and ASCEND will not attempt to change that value. On the other hand, with free variables, ASCEND will try to determine a way to calculate the value, using equations defined in the [[MODEL]] and the known values of other variables that have already been solved or fixed. | The '''FIX''' and '''FREE''' statements are used to constrain (fix) and unconstrain (free) variables. A variable which has been fixed has a known value assigned to it, and ASCEND will not attempt to change that value. On the other hand, with free variables, ASCEND will try to determine a way to calculate the value, using equations defined in the [[MODEL]] and the known values of other variables that have already been solved or fixed. | ||
[[Category: | [[Category:Syntax]] | ||
Revision as of 08:59, 2 August 2010
The FIX and FREE statements are used to constrain (fix) and unconstrain (free) variables. A variable which has been fixed has a known value assigned to it, and ASCEND will not attempt to change that value. On the other hand, with free variables, ASCEND will try to determine a way to calculate the value, using equations defined in the MODEL and the known values of other variables that have already been solved or fixed.