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ire = fsolve(@(re) Pgls(P,BV0,FROE,B,re),re0);
is their a way to force fsolve to return a positive ire?

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Torsten
Torsten 2016-6-23

0 个投票

Insert re^2 instead of re in your equation. When fsolve has finished, take the square root of the value returned.
Best wishes
Torsten.

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Matt J
Matt J 2016-6-23
编辑：Matt J 2016-6-23

0 个投票

Instead of fsolve, use lsqnonlin, which lets you put bounds on the solution,
ire = lsqnonlin(@(re) Pgls(P,BV0,FROE,B,re),re0,0);

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