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Index exceeds the number of array elements (101)

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Lujain Almarhabi
Lujain Almarhabi on 27 Feb 2021
Edited: Lujain Almarhabi on 27 Feb 2021
I keep getting this error for a function I wrote. Not quiet sure what it really means since I think the sizes of xe and xb are correct. This function will take some array (charge density) and updates it using the "new" particle positions (xe, xb)
The error message:
Index exceeds the number of array elements (101).
Error in Rho (line 41)
rho(step_1) = rho(step_1) + q*(x(step) - x_p(i))/(dx^2); % rho(j-1)
Error in WeakBeam (line 150)
rhob = Rho(rhob,xb,qb,x,dx);
In weakBeam main code the line before rhob is rhoe and it seems to be working fine although xb and xe are the same sizes. So I am not sure why specifically line 41 is the problem?
I will be attaching the two files (WeakBeam) and function Rho as well
  4 Comments
Lujain Almarhabi
Lujain Almarhabi on 27 Feb 2021
Thanks Walter, I fixed the error, now the code is working.

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Answers (1)

Jan
Jan on 27 Feb 2021
Use the debugger to find the not matichiung index. Type this in the command window:
dbstop if error
and run the code again. When Matlab stops, check the value of the indices:
% rho(step_1) = rho(step_1) + q*(x(step) - x_p(i))/(dx^2)
size(rho)
step_1
size(x)
step
size(x_p)
i
  3 Comments
Lujain Almarhabi
Lujain Almarhabi on 27 Feb 2021
So I was able to fix it by changing rhob in the main code to just rho and same thing with rhoe :/

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