Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.
118 ビュー (過去 30 日間)
古いコメントを表示
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
0 件のコメント
採用された回答
Walter Roberson
2020 年 1 月 6 日
F = @(x,xdata)1-x(1)*exp(-(x(2)./xdata).^(x(3)));
6 件のコメント
Thi Na Le
2020 年 2 月 27 日
ydata in previous reply was wrong. this is modification:
a0=4;
xdata=...
[5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 155 160 165 170 175 180];
ydata=...
[0.04178 0.081 0.09475 0.1157 0.1326 0.1468 0.1587 0.169 0.178 0.186 0.193 0.199 0.205 0.211 0.215 0.22 0.224 0.229 0.233 0.238 0.242 0.245 0.248 0.251 0.254 0.257 0.258 0.261 0.264 0.266 0.269 0.272 0.274 0.277 0.273 0.275];
fun=@(x,xdata)a0*(1+((4.5*x(1)*x(2)*xdata)/(5.5+x(2)*xdata)));
x0=[0.01 0.0001];
>> plot(xdata,ydata,'o')
>> x = lsqcurvefit(fun,x0,xdata,ydata)
Error using lsqcurvefit (line 262)
Function value and YDATA sizes are not equal.
その他の回答 (1 件)
Alex Sha
2020 年 1 月 7 日
Hi,Thaer Ismail, which is your exact fit function: "ydata=1-x1*exp(-(x2/xdata)^x3)" or "ydata=1-x1*exp((-x2/xdata)^x3)" ?
if the former, take initial start values as:
x0 = [-23124 0.3 -2.2];
参考
カテゴリ
Help Center および File Exchange で Get Started with Curve Fitting Toolbox についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!