Hello, this is the matlab message: "Undefined operator '*' for input arguments of type 'LinearModel'"

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Gabriele Maduri
Gabriele Maduri 2024-9-13
评论： Gabriele Maduri 2024-9-13
load ('DATI_PAZ1');
LV_1=LV;
lat_1=lat;
sept_1=sept;
time_1=time;
load ('DATI_PAZ2');
LV_2=LV;
lat_2=lat;
ant_2=ant;
time_2=time;
figure
plot(time_1,LV_1,'k')
hold on
plot(time_1,lat_1,'b')
hold on
plot(time_1,sept_1,'r')
grid on
xlabel('time [s]'),ylabel('colpi/(s*voxel)')
title('Conc. FDG - CASO I')
legend('ventr.sx','laterale','setto')
figure
plot(time_2,LV_2,'k')
hold on
plot(time_2,lat_2,'b')
hold on
plot(time_2,ant_2,'r')
grid on
xlabel('time [s]'),ylabel('colpi/(s*voxel)')
title('Conc. FDG - CASO II')
legend('ventr.sx','laterale','anteriore')
y_lat_1=lat_1./LV_1;
y_sept_1=sept_1./LV_1;
x_1=cumtrapz(time_1,LV_1)./LV_1;
figure
subplot(1,2,1)
plot(x_1,y_lat_1,'*b')
hold on
plot(x_1,y_sept_1,'*r')
title('Patlak graph - CASO I')
F_sept_1=fitlm(x_1(18:24,1),y_sept_1(18:24,1),'poly1');
hold on
plot(F_sept_1)
F_lat_1=fitlm(x_1(18:24,1),y_lat_1(18:24,1),'poly1');
hold on
plot(F_lat_1)
legend('parete laterale','setto')
xlabel('trapz( C_p(t) dt)/C_p(t) [s]'),ylabel('C_t(t)/C_p(t) [adimensionale]')
m_setto_1=F_sept_1;
m_laterale_1=F_lat_1;
LC = 0.67;
Cp = 100/100;%mg/cm^3 passaggio da dl a cm^3
rho=1.08;%g/cm^3
R_setto_1=m_setto_1*60*Cp/LC*(1/rho); %error
R_laterale_1=m_laterale_1*60*Cp/LC*(1/rho); %error

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回答（1 个）

Sameer
Sameer 2024-9-13
编辑：Sameer 2024-9-13
Hi Gabriele
The error message you're encountering, "Undefined operator '*' for input arguments of type 'LinearModel'," indicates that you are trying to use the multiplication operator * with a LinearModel object, which is not directly supported in MATLAB.
The "fitlm" function returns a LinearModel object, which contains information about the fitted model, but it is not a numeric value that can be directly multiplied.
To resolve this, extract the slope (coefficient) from the LinearModel object before performing the multiplication. Here's how you can modify the code:
% Assuming F_sept_1 and F_lat_1 are LinearModel objects from fitlm
m_setto_1 = F_sept_1.Coefficients.Estimate(2); % Extract the slope (second element)
m_laterale_1 = F_lat_1.Coefficients.Estimate(2); % Extract the slope (second element)
LC = 0.67;
Cp = 100/100; % mg/cm^3 conversion from dl to cm^3
rho = 1.08; % g/cm^3
% Now you can perform the multiplication
R_setto_1 = m_setto_1 * 60 * Cp / LC * (1 / rho);
R_laterale_1 = m_laterale_1 * 60 * Cp / LC * (1 / rho);
Please refer to the below MathWorks documentation link:
https://www.mathworks.com/help/stats/fitlm.html
Hope this helps!

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