I have a set of DAEs to be solved for state and algebraic variables in the form of vectors. Two vectors of the state variables (say V1 and V2) must be greater than zero; that is each element in V1 and V2 must return positive value. I want to tell ode15s to solve the problem considering this constraint. I tried V1(V1<0)=0; V2(V2<0)=0; but did not work. The way I know it did not work is when I plot V1 and V2 after solving the problem using ode15s, the are negative parts in the plots.
Any idea?
Thanks
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