delete(var)

Hi all,

Usually NCL is quite tolerant about cleaning up after your script. No
need to delete(var) everything that was used. This is less the case for
scripts which assign a variable in a loop. Often, the dimension of the
RHS of the assignement changes and since the variable on the LHS already
exists, NCL issues the following error...

fatal:Dimension sizes of left hand side and right hand side of
assignment do not match

A bogus example of this behaviour is the following...

do i=1,10
  j=rand()
  a=fspan(0.,1.,j)
end do

...where the correct result would be achieved by the following...

do i=1,10
  j=rand()
  a=fspan(0.,1.,j)
  delete(a)
end do

In the case of a loop over several files and several variables and
making several plots inside these loops, the manual deletion of all
possible variables where such an error could occurr is rather
cumbersome. A much more elegant solution would be the introduction of a
new assignement operator (for example := ) which would assure the
deletion of the LHS if it already exists upon assignement.

Does anything like that already exist in NCL?
Is there a more elegant solutin than manual deletion of all variables?

Thanks,
Oli

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Received on Wed Oct 15 2008 - 08:21:10 MDT