error:Index exceeds matrix dimensions.

Hello, I am trying to understand the problem here. The error is in (line 51) which is the one I have on either end. I cannot seem to figure it out. Any ideas?

%This begins the force analysis

for turn=['a','b','c','d','e','f','g']

    r.(turn).r3=.331;
    r.(turn).force=r.(turn).force(:,2);
    r.(turn).v=length(r.(turn).force);
    r.(turn).justtime=r.(turn).justtime(1:r.(turn).v);
    r.(turn).justangle=r.(turn).justangle(1:r.(turn).v);
    r.(turn).sinangle=sin(r.(turn).justangle);
    r.(turn).nettorque=(r.(turn).r3)*(r.(turn).sinangle).*(r.(turn).force);
    for b=1:(r.(turn).v);
        * *r.(turn).deltatorque(b)=r.(turn).nettorque(b+1)-r.(turn).nettorque(b);* *
    end
    r.(turn).deltatorque=r.(turn).deltatorque.';
    r.(turn).network=(r.(turn).nettorque(1:r.(turn).v)).*(r.(turn).deltatheta(1:r.(turn).v));
    r.(turn).deltapotential=(r.(turn).nettorque).*(r.(turn).justangle);
    r.(turn).gravity=(9.81*(r.(turn).m))*(r.(turn).deltatheta);
    r.(turn).withoutgravity=(r.(turn).deltapotential(1:r.(turn).v))-(r.(turn).gravity(1:r.(turn).v));
    r.(turn).totalwork=sum(r.(turn).withoutgravity);
    fprintf('The Total Work is %f\n',r.(turn).totalwork)
end

[Geoff Hayes]

Rachel - what is line 51 in the above code? Please attach your function rather than just copying and pasting part of the code. Unless it is the line

 r.(turn).deltatorque(b)=r.(turn).nettorque(b+1)-r.(turn).nettorque(b);*

If the above line is causing the problem then do the following: before running your function type the following in the command window

 dbstop if error

Now run your code and when the above error occurs, the MATLAB debugger will pause at the line that is causing the problem. When this happens, look at the variables - what is b, what is the length of r.(turn).nettorque(b+1), etc. Evaluate each piece of this line and check to see where the code is failing.

[Stephen23]

Please upload the whole code using the paperclip button, then we can check this properly.