MATLAB: Error occur with comment “Subscript indices must either be real positive integers or logicals” while plotting

MATLABplotting

clear all;
close all;
X=-10:1:10;
T=-10:1:10;
C1=2;
C2=1;
b=-1.5;
[x,t]=meshgrid(X,T);
x1=C1*(C1*exp(sqrt(2)*b*x)+C2*exp(-sqrt(2)*b*x)).*sin(1/2*sqrt(-1i.^4*b.^2+4)*t).*(C1*exp(sqrt(2)*b*x)+C2*exp(-sqrt(2)*b*x))+C2*(C1*exp(sqrt(2)*b*x)+C2*exp(-sqrt(2)*b*x)).*cos(1/2*sqrt(-1i.^4*b.^2+4)*t).*(C1*exp(sqrt(2)*b*x)+C2*exp(-sqrt(2)*b*x));
y1=-1/2*C1*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).*cos(1/2*sqrt(-1i.^4*b^2+4)*t).*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*sqrt(-1i*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^4*b(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^2+4)+1/2*C2*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).*sin(1/2*sqrt(-1i.^4*b^2+4)*t).*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*sqrt(-1i.*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^4*b*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^2+4)-1/2*1i*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^2*b*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*C1*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*sin(1/2*sqrt(-1i.^4*b^2+4)*t).*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))-1/2*1i*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x)).^2*b*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*C2*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x))*cos(1/2*sqrt(-1i.^4*b^2+4)*t).*(C1*sqrt(2)*exp(sqrt(2)*b*x)-C2*sqrt(2)*exp(-sqrt(2)*b*x)-C1*exp(sqrt(2)*b*x)-C2*exp(-sqrt(2)*b*x));
A=-2*1i*b*x1.*conj(y1);
B=x1.*conj(x1)+y1.*conj(y1);
R=(A./B);
surf(x,t,abs(R))
When I evaluate it, error occur with comment "Subscript indices must either be real positive integers or logicals".
How to remove it?

Best Answer

C2*exp(-sqrt(2)*b*x)).^4*b(C1*sqrt(2)*exp(sqrt(2)*b*x) is missing an operation between the b and the (C1
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