## 504 Reputation

12 years, 21 days

## @suddenman  First: Replace this l...

First:

Replace this line : bc := (D[1](u(x, t)))(0) = 0, (D[1](u(x, t)))(l) = 0, u(x, 0) = cos(2*Pi*x/l)

with bc:=D[1](u)(0,t)=0,D[1](u)(l,t)=0,u(x,0)=cos(2*Pi*x/l);

But there is problem in your boundary conditions which should be revised

## Example worksheet...

Can you give example worksheet where you have error ?

## Example worksheet...

Can you give example worksheet where you have error ?

## reverse it also...

To get a constant positif current, you should also reverse it

## reverse it also...

To get a constant positif current, you should also reverse it

## arctan...

You have two solutions with the function arctan which has two arguments seprated with comma.

## arctan...

You have two solutions with the function arctan which has two arguments seprated with comma.

## Thanks, but it work only for text...

Thanks, but it work only for text and not for variables and command (mod math) in expressions or equations

In Classic worksheet ok it work

## Thanks, but it work only for text...

Thanks, but it work only for text and not for variables and command (mod math) in expressions or equations

In Classic worksheet ok it work

## K2(x) ?...

Could you give K2(x) ?

## Thank you...

selectremove(has,f,i) do the trick