MATLAB: Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

curve fittingMATLAB

raw = xlsread('File', 2); % read in sheet number 2
Pc = raw(60:141, 1); 
Sw = raw(60:141, 9); 
plot(Sw,Pc,'ro')
 F = @(x,xdata)1-x(1)*exp(-(x(2)/xdata)^(x(3)));
x0 = [3 6 0.6];
[x,resnorm,~,exitflag,output] = lsqcurvefit(F,x0,Sw,Pc)

I keep getting this error.

Error in Skelt_LS_Code (line 16)

[x,resnorm,~,exitflag,output] = lsqcurvefit(F,x0,Sw,Pc)

Caused by:

Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

Any help is appreciated. Thank you

Best Answer

 F = @(x,xdata)1-x(1)*exp(-(x(2)./xdata).^(x(3)));

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MATLAB: Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

format long g
zdata=[2370.1776112981,26665.5436328856,33999.0700566522,43581.3827551805,56913.3992480947,88844.7226527384,130991.934524133,15112.911231467,176285.501029454,223360.820798491,294455.827929450,35478.787278946,411258.878280649,422702.346106183,511111.835129998,633910.342810244,780340.236378774,619555.134715430,633756.837052416,788803.530398270,777517.401792431,773693.310713579,844333.304097923,150471.6450798029,20517.8541413645,28176.4764184613,29779.9220185300,584153.2552467975,757318.1239141541,984123.5255855076,127002.474102260,157119.325006092,211544.282909359,281369.717982640,271505.093553462,327050.316856829,344420.741097441,374147.438486281,421984.526771006,432866.381682883,554318.948982768,471859.782416242,584014.198110098,622301.344956696]
zdata = 1×44
           2370.1776112981          26665.5436328856          33999.0700566522          43581.3827551805          56913.3992480947          88844.7226527384          130991.934524133           15112.911231467          176285.501029454          223360.820798491           294455.82792945           35478.787278946          411258.878280649          422702.346106183          511111.835129998          633910.342810244          780340.236378774           619555.13471543          633756.837052416           788803.53039827          777517.401792431          773693.310713579          844333.304097923          150471.645079803          20517.8541413645          28176.4764184613            29779.92201853          584153.255246797          757318.123914154          984123.525585508
ydata=[473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,473.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,483.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000,493.150000000000];
xdata=[1.08768000000,4.56728200000,4.99472000000,5.392799100000,6.791900000,8.11234546400000,11.3288295200000,15.2542138200000,23.7895322600000,38.9844910700000,70.9384511000000,100.361732800000,139.249301900000,168.187221200000,275.463489000000,323.697079700000,380.152481600000,511.387441300000,718.018141700000,852.617257800000,927.814899300000,1311.46673800000,1594.53133400000,2.170800000,3.2341306200000,4.161204900000,6.9362766600000,7.13110839100000,12.3316076700000,15.1135745800000,26.7895322600000,37.2653961400000,50.5485060700000,80.8837167700000,89.4791805100000,115.361732800000,129.025620400000,135.094336600000,219.59504900000,258.623830500000,333.908380200000,328.757892400000,444.190385600000,630.380891400000,751.682901300000,871.212537500000,1157.09126200000,1521.09905800000,4.75969298600000,7.91421685000000,10.4898360300000,13.7855398600000,23.1085904900000,30.23414500000,44.5823445700000,67.94350200000,92.278451600000,120.278265300000,122.956453700000,281.618343800000,333.757892400000,419.290040000000,555.402383500000,628.192380300000,831.755300000];
size(xdata)
ans = 1×2
     1    65
size(ydata)
ans = 1×2
     1    61
N = min([length(xdata), length(ydata), length(zdata)]);
data = [xdata(1:N); ydata(1:N)].';  %x y must be columns
fun= @(a,data)(1./a(1)).*(((data(:,1).*exp(a(2)./(8.314.*data(:,2)))./a(3)).^(1./a(4)))+sqrt((((data(:,1).*exp(a(2)./(8.314.*data(:,2)))./a(3)).^(2./a(4)))+1)));
a0 = [3; 66666; 2e+10; 2];
lb=[0; 5555; 1e+10 ; 0];
ub=[258; 205588; 1e+15 ; 4];
a = lsqcurvefit(fun, a0, data, reshape(zdata(1:N), [], 1),lb ,ub)
Local minimum possible.
lsqcurvefit stopped because the size of the current step is less than
the value of the step size tolerance.
a = 4×1
      7.36857657624095e-06
          76932.5702990955
          18995165527.3496
          2.83794699233607

MATLAB: Failure in initial objective function evaluation. PARTICLESWARM cannot continue.

particleswarm never passes two separate parameters to an objective function. You need to pack all of the parameters together into a single vector. You can separate them into separate variables inside the function.

Best Answer

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MATLAB: Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

MATLAB: Failure in initial objective function evaluation. PARTICLESWARM cannot continue.

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