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Lester,

Here is my approach.

https://www.dropbox.com/scl/fi/j0jx471yw04u6ozv95e1c/Equation.zip?rlkey=qe2j2yodnm264yy002fgvddea&st=l69lb1x9&dl=0

Lester,

Yes, there is a limit of about 70 lines of code that can be posted here.

Dropbox file sharing is one alternative, which seems to work well.

There is also the Clearwin Examples folder at the Silverfrost GitLab folder. Link on the RHS of the Silverfrost homepage which points to https://gitlab.com/silverfrost

I have found the content of ...

Lester,

Like Bill, I'm struggling to understand what you are trying to achieve.

However, I played about with your code and it may be that this provides something like what you are looking for? ...

Here is another fractal - the Barnsley fern.

There a few tricks with the %pl margin, frame, etched, external_ticks and x_min etc, options, which along with an offset in the x axis values passed to ...

Paul,

Thanks for the fix. That will simplify the recursive function in the arcing program!.

Re John's program. Here is a reduced version which generates error 84.

As USE ISO_FORTRAN_ENV is ...

Here is another example which appeals to the electrical engineer or �sparky� in me.

The program simulates an electrical arc between two arcing horns in 2D, using midpoint displacement and recursion ...

The following program P1 runs as expected, returning the output shown.

program p1
use iso_fortran_env
implicit none
real, allocatable :: a(:), temp(:)
print*, co ...

Lester,

cmdmsg has intent(inout) so needs to be initialised to " ".

program p
implicit none
integer :: cstat, estat
character(100) :: cmsg
cmsg = ' '

! T ...

Paul,

Pleased to report that my further tests did not identify any additional problems.

Here is one with multiple graphs.

https://www.dropbox.com/scl/fi/cuu91mgnsmrjeqr6wbblf/three_pl_buffere ...

What do the optional arguments CMDSTAT, and CMDMSG return?

Thanks Paul,

For some reason I had it in my head that the requirement for n_graphs to be in the first winop@ call only applied when n_graphs > 10. I�m pretty sure that�s stated in the documen ...

Paul,

If you run this program a dozen times, you may get a surprise. Using winop@ calls and extremely rapid update I occasionally get the clearwin error "Too many colours for %pl plot". ...

Plato also seemed to flicker a bit.
Plato was not updated!

I have not seen any problems of this type.

Paul, Thanks for your efforts on this. My test code works as expected now.