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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

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

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