Index exceeds the number of array elements (101)

1 次查看（过去 30 天）
Jamie Al
Jamie Al 2021-2-27
编辑： Jamie Al 2021-2-27
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 个评论
显示 2更早的评论
Jamie Al
Jamie Al 2021-2-27
Thanks Walter, I fixed the error, now the code is working.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Jan
Jan 2021-2-27
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 个评论
显示 1更早的评论
Jamie Al
Jamie Al 2021-2-27
Ok, I see in the workspace it says i =3, but I have no idea how is that possible? i in the WeakBeam main code goes from 1:numSteps which is 5000 and i in the function goes from 1 to x_p which is 100. Is it being overwritten somehow?
Jamie Al
Jamie Al 2021-2-27
So I was able to fix it by changing rhob in the main code to just rho and same thing with rhoe :/

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by