MATLAB: Error in code, “Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses. “

dataequationerrorinvalid expression

clear
clc
 m1=1;
 m2=0.5;
 m3=0.2;
 
 rp=87;
 R1=rp-r1;
 R2=rp-r2;
 R3=r3-rp;
 
 l=2.27;
 r2=[58.7 27.8 20 59 30 31.2 68.5 67 34 60 39 50.3 50 45.3 45]';
 r3=[12.89 20.65 226 120 217 193.1 91.6 110 197.5 166 158.3 142.1 150 176.5 122]';
 Rb=(((1/2).1)-rp); 
 
 x=R2
 y=R3
 
 
G=x;
G(:,2) = ones(length(x), 1);
delta = G \ y
slope=delta(1,1)
intercept=delta(2,1)
m_b = m2./Rb.*slope-(m1./Rb).*R1
sigma = sqrt(sum((y-x).^2)./(length(x)-1));
se1 = sigma.*sqrt(1./((length(x)+mean(y)^2/((length(x)-1)*std(x)^2))));
se2 = sigma.*sqrt(1./((length (x)-1)*std(x)^2));
Ci1=tinv(.975,length(x)-1).*se1;
Ci2=tinv(.975,length(x)-1).*se2;
% creating a line of best fit
X = [min(x);1e-3;max(x)]';
Y = delta(1,1) + delta(2,1).*X;
SE=sigma.*sqrt(1/length(x)+(X-mean(x)).^2./((length(x)-1)*std(x).^2));
Ci=tinv(.975,length(x)-1).*SE;
figure(1)
clf
plot(m1, m2, 'ob')
hold on
% plotting the conidence intervals
plot (X, Y, 'R')
plot(X,Y+Ci,'g--')
plot(X,Y-Ci,'g--')
hold off
xlabel('$$-$$','interpreter','latex')
ylabel('$$-)$$','interpreter','latex')
print(figure(1), '-dpng', 'figure1')

Best Answer

 Rb=(((1/2).1)-rp);
You do not have an operator between the (1/2) and the following .1
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