I am using the following code:
%Import data as time and voltage:
load VoltageData.mat;load('OCP_Cathode.mat'); %Load the OCP data for the cathode
load('OCP_aNODE.mat'); %Load OCP data for the anode;
SOC_a=OCP_Anode(:,1);SOC_c=OCP_Cathode(:,1);OCV_a=flip(OCP_Anode(:,2));OCV_c=OCP_Cathode(:,2);time=VoltageData(:,1);voltage=VoltageData(:,2); %Import the applied current data
%Set it to the correct value:
I_app=0.12*ones(1,10);Time=time/time(end);%Get the data to be used:
t_data=linspace(0,Time(end),10);L=length(Time);V_data=interp1(Time,voltage,t_data);%Choose initial conditions for the parameters:
X_0=zeros(10,1);X(1)=0.9;X(2)=0.2;X(3)=1;X(4)=1.5;X(5:end)=10^-6;X_0=X;lb=zeros(1,10);ub=ones(1,10);%Set up the function for lsqcurvefit:
fun = @(X,t)terminal_voltage(V_data,I_app,mu_n,t_data,X,SOC_a,SOC_c,OCV_c,OCV_a);x = lsqcurvefit(fun,X_0',t_data,V_data,lb,ub);The function terminal_voltage is given by:
function V=terminal_voltage(V_exp,I_app,mu_n,t,X,SOC_a,SOC_c,OCV_c,OCV_a)gamma_plus=X(5);gamma_minus=X(6);nu_plus=X(9);nu_minus=X(10);SOC_cathode=cathode_c(I_app,mu_n,1,t,X);SOC_anode=anode_c(I_app,mu_n,1,t,X);O_plus=interp1(1-SOC_c,OCV_c,SOC_cathode);O_minus=interp1(SOC_a,OCV_a,SOC_anode);V=eta_plus(SOC_cathode,I_app,X)-eta_minus(SOC_anode,I_app,X)+O_plus-O_minus-V_exp';I get the error:
Error using lsqcurvefit (line 262)
Function value and YDATA sizes are not equal.
Error in inverse_SPM (line 49)
x = lsqcurvefit(fun,X_0',t_data,V_data,lb,ub);
I'm not too sure what's going on. How do I check the size of the function value? How do I correct it, so lsqcurvefit works?
Best Answer