Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue.
显示 更早的评论
My code below generates the following error. I have been stuck at it and Im not sure why. It works for an exponential version.
x = load('depth-0.txt');
y = load('mean-0.txt');
F = @(p,x) (p(1) + p(2)*(x*x));
x0 = [-1 1];
[p,resnorm] = lsqcurvefit(F, x0, x, y);
estimate_x = 1:0.1:100;
estimate_y = (p(1) + p(2)*(estimate_x*estimate_x));
plot(estimate_x, estimate_y,'-','LineWidth',2);
Error using * Inner matrix dimensions must agree.
Error in @(p,x)(p(1)+p(2)*(x*x))
Error in lsqcurvefit (line 199) initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Caused by: Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue.
采纳的回答
Walter Roberson
2017-2-7
F = @(p,x) (p(1) + p(2).*(x.*x));
The parameter you are describing as x will be a matrix. The * operator in MATLAB is algebraic matrix multiplication from linear algebra, which requires that the number of columns of the array on the left hand side be equal to the number of rows of the array on the right hand side of the * operator. With x * x the only way that could happen is if x was square.
The .* operator is element-by-element multiplication.
2 个评论
RuiQi
2017-2-7
shariq khan
2018-11-18
x0 = [1,1,1e-9];
lb = [-inf,-inf,-inf];
ub = [inf,inf,inf];
fun = @(x) x(1) + x(2).*exp(-t.*x(3));
vmut_obtained = lsqcurvefit(fun,x0,t,vmut,lb,ub);
couldnt upload data set, as it is 1x157 vector
I get similar error for this function .any suggestion?
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Nonlinear Least Squares (Curve Fitting) 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
