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matlableast-squares

matlab: lsqcurvefit, only one upper bound

simple question.. Is it possible to set only one upper bound for lsqcurvefit, without limiting others?

I need something like:

lb = [0 0 0];
ub = [~ ~ 5];

Thanks!

Solution

  • From help lsqcurvefit:

    X = LSQCURVEFIT(FUN,X0,XDATA,YDATA,LB,UB) defines a set of lower and

    upper bounds on the design variables, X, so that the solution is in the
range LB <= X <= UB. Use empty matrices for LB and UB if no bounds
exist. Set LB(i) = -Inf if X(i) is unbounded below; set UB(i) = Inf if
X(i) is unbounded above.

    So yes, Dan Becker is right -- using 

    lb = [   0  0  0];
ub = [inf inf  5];

    will do the trick.