Restricting domain of values fzero will try

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Alexander Holmes
Alexander Holmes 2018-10-30
评论： Alexander Holmes 2018-10-30
I am using fzero along with an implementation of the gillespie algorithm to determine a parameter (I know the vale of a parameter at steady state, but now I want it proportional to another quantity, and I am using fzero to determine this constant of proportionality, alpha).
However, the simulation only works if alpha is positive, otherwise we get negative rates which mess everything up. From what I can tell, fzero is trying negative values of alpha when trying to find the zero. Is there any way I can restrict fzero to only use positive values?

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Matt J
Matt J 2018-10-30
编辑：Matt J 2018-10-30
Specify the search interval [xlower, xupper] to include only non-negative values.
fzero(fun,[xlower, xupper])
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Matt J
Matt J 2018-10-30
You could make a change of variables in your function like s^2=alpha. An unconstrained search over s is equivalent to a search of non-negative alpha.

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Matt J
Matt J 2018-10-30
You could make a change of variables in your function like s^2=alpha. An unconstrained search over s is equivalent to a search of non-negative alpha.

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