2D Fortran arrays plots, weird behaviour

Hello,

I'm trying to plot a 2D fortran array during a debug session with ddd.

If I declare a 20,10 array (using m=10 line 3 in the code), the data plots in 3D, which is what I expect.
If I declare a 20,11 array (using m=11 line 3 in the code), the data plots as several 2D plots, which is quite weird.
(Indeed, the generated gnuplot script (in the logfile) is slightly different).

I tried this with ddd 3.3.11 and ddd 3.3.12, and gfortran 4.4.1

Is this a known behaviour ? If so, is there a special setting to avoid this ?




program mat_transf
   implicit none
   integer, parameter   :: n = 20, m = 11
   integer c,l
   real, dimension(n,m) :: mat
   integer              :: choix_methode, ios, num_ligne
   real, external       :: carre, identite, logarithme
   real, intrinsic      :: sqrt

   do l=1,n
	do c=1,m
  		call random_number(mat(l,c))
         enddo
   enddo


       call transform( mat, n, m, sqrt )


end

subroutine transform( t, n, m, f )
   implicit none
   integer              :: n, m, i, j
   real, dimension(n,m) :: t
   real                 :: f

   do i=1,n
     do j=1,m
       t(i,j) = f(t(i,j))
     end do
   end do
end subroutine transform



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