Error: ()-indexing must appear last in an index expression.

clc
clear all
g=xlsread('try22.xlsx');
Dq=g(:,8);
Dz=g(:,9);
Du=g(:,10);
Dv=g(:,11);
Qa=g(:,12);
t=9.81;
R2=[ ];
for i=1:length(g)
                    R1(i)=(t*(Dq(i)/Dz(i)))/(Qa(i)((Du(i)/Dz(i))^2+(Dv(i)/Dz(i))^2))
                    R2=[R2;R1(i)];
end

[Walter Roberson]

The fragment

(Qa(i)((Du(i)/Dz(i))^2

Has no operation between Qa(i) and what follows.

Madhan assumes that multiplication was intended, which is plausible.

Answer 1

[madhan ravi]

No loop is needed:

R1=(t*(Dq./Dz)) ./ (Qa.*((Du./Dz).^2+(Dv./Dz).^2));
R2 = R1(:)