[ojAlgo-user] How do I use OJALGO to solve an ExpressionBasedModel with absolute constraints on variables?

[Anthony E. <ant...@al...>]

Hi

I am doing a simple expression based model but wish to add a constraint 
to the model such that the sum of absolute values of the variables must 
equal a fixed value.

I can see that I can do like this ...
                 final Expression tmpBalanceExpression = 
model.addExpression("balance");
                 for (int i = 0; i < vars.length; i++) {
                     tmpBalanceExpression.setLinearFactor(i, ONE);
                 }
... to set the total value of all the variables to 1, but how can I set 
the sum of the absolute values of those variables to a value?

Any ideas?

Thanks

Tony