urgent help, lsqcurvefit
in [Matlab]
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From: anna fu on 23 Feb 2010 21:15 hi, everyone! when i use lsqcurvefit for four-parameter curve fitting, i find that the lower and upper bounds cannot be added to the function. otherwise, there is errors as the following. Exiting due to infeasibility: 1 lower bound exceeds the corresponding upper bound. the number may 2 or 4 under different conditions. are there any errors in the usage? [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = lsqcurvefit(@mymodel1, start0, xdata, ydata, 'lb', [1 Pm 1 1], 'ub', [Pm (middle + 1) * Pm Pm Pm], 'option'); there is error too if the function is changed to the following form. [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = lsqcurvefit(@mymodel1, start0, xdata, ydata, [1 Pm 1 1], [Pm (middle + 1) * Pm Pm Pm], 'option'); ??? Error using ==> optimget at 37 First argument must be an options structure created with OPTIMSET. Error in ==> lsqncommon at 123 mtxmpy = optimget(options,'JacobMult',[]); % use old Error in ==> lsqcurvefit at 186 [x,Resnorm,FVAL,EXITFLAG,OUTPUT,LAMBDA,JACOB] = ... Error in ==> decon_lsqct_1DA at 40 [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = lsqcurvefit(@EMGmodel_sumA, start0, xdata, ydata, [1 Pm 1 1], [Pm (middle + 1) * Pm Pm Pm], 'option'); so, how to use the function lsqcurvefit correctly? thanks a lot for ur efforts. anna
From: Steven Lord on 23 Feb 2010 23:41 "anna fu" <chuanbi.fu(a)gmail.com> wrote in message news:hm1oup$aer$1(a)fred.mathworks.com... > hi, everyone! > > when i use lsqcurvefit for four-parameter curve fitting, i find that the > lower and upper bounds cannot be added to the function. otherwise, there > is errors as the following. > Exiting due to infeasibility: 1 lower bound exceeds the corresponding > upper bound. > the number may 2 or 4 under different conditions. > > are there any errors in the usage? > [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = > lsqcurvefit(@mymodel1, start0, xdata, ydata, 'lb', [1 Pm 1 1], 'ub', [Pm > (middle + 1) * Pm Pm Pm], 'option'); > > there is error too if the function is changed to the following form. > [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = > lsqcurvefit(@mymodel1, start0, xdata, ydata, [1 Pm 1 1], [Pm (middle + 1) > * Pm Pm Pm], 'option'); Yes, both those will error as they don't correspond to a valid calling syntax for LSQCURVEFIT. Reread the reference page (doc lsqcurvefit) -- it will list the syntax that the function supports. Your second syntax is close, but you don't need to pass the _name_ of the options structure but the options structure itself. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Bruno Luong on 24 Feb 2010 02:47 "anna fu" <chuanbi.fu(a)gmail.com> wrote in message <hm223t$98k$1(a)fred.mathworks.com>... > hi, everyone! > > when i use lsqcurvefit for four-parameter curve fitting, i find that the lower and upper bounds cannot be added to the function. otherwise, there is errors as the following. > Exiting due to infeasibility: 1 lower bound exceeds the corresponding upper bound. > the number may 2 or 4 under different conditions. > > are there any errors in the usage? > [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = lsqcurvefit(@mymodel1, start0, xdata, ydata, 'lb', [1 Pm 1 1], 'ub', [Pm (middle + 1) * Pm Pm Pm], 'option'); > > there is error too if the function is changed to the following form. > [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = lsqcurvefit(@mymodel1, start0, xdata, ydata, [1 Pm 1 1], [Pm (middle + 1) * Pm Pm Pm], 'option'); > > ??? Error using ==> optimget at 37 > First argument must be an options structure created with OPTIMSET. > > Error in ==> lsqncommon at 123 > mtxmpy = optimget(options,'JacobMult',[]); % use old > > Error in ==> lsqcurvefit at 186 > [x,Resnorm,FVAL,EXITFLAG,OUTPUT,LAMBDA,JACOB] = ... > > Error in ==> decon_lsqct_1DA at 40 > [p4_resu, resnorm, residual, exitflag, output, lambda, jacobian] = > lsqcurvefit(@EMGmodel_sumA, start0, xdata, ydata, [1 Pm 1 1], [Pm > (middle + 1) * Pm Pm Pm], 'option'); > > so, how to use the function lsqcurvefit correctly? thanks a lot for ur efforts. The error message is clear: the OPTION argument must be a structure. What do you pass? Bruno
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