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I have a function that I'm trying to minimize. It currently works reasonably well with this:

FindMinimum[{chiSquared[ber, btm, dsr, dcd], 
  0 < ber && 0 < btm && 0 < dsr && 0 < dcd}, {{ber, 1.}, {btm, 
   10^10}, {dsr, 1.}, {dcd, 1000}}]

But the conditions seem like extra work. Is there an easier way to tell these kinds of functions that they should only consider positive, real numbers when working on a solution?

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  • $\begingroup$ I do it like this: vars = {ber, btm, dsr, dcd}; init = {1., 10^10, 1., 1000}; FindMinimum[{chiSquared[ber, btm, dsr, dcd], Thread[0 < vars]}, Thread[{vars, init}]] -- maybe it's better? $\endgroup$
    – Michael E2
    Apr 21, 2020 at 21:57

1 Answer 1

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This seemed to do the trick:

FindMinimum[{chiSquared[ber, btm, dsr, dcd], Element[{ber, btm, dsr, dcd}, PositiveReals]}, {{ber, 1.}, {btm, 10^10}, {dsr, 1.}, {dcd, 1000}}];
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