[ncl-talk] variable metadata getting overwritten when variable is written to a NetCDF4 file

[Keith Lindsay]

Hi,
Thanks Dennis. For other users that run into this behavior, a workaround to
avoid it is to ensure that the variable on the rhs of the problematic
assignment does not have the _FillValue attribute. I.e.
      if (isatt(tmpvar, "_FillValue")) then
        delete(tmpvar at _FillValue)
      end if
Keith

On Mon, Nov 2, 2015 at 8:44 AM, Dennis Shea <shea at ucar.edu> wrote:

> A JIRA ticket [  NCL-2302 ] has been opened.  THX
>
> On Mon, Nov 2, 2015 at 8:06 AM, Keith Lindsay <klindsay at ucar.edu> wrote:
> > Hi,
> >
> > I have come across an instance where I'm writing a variable to a file and
> > the variable metadata in the file is getting overwritten, even though I'm
> > using (/ ... /) on the right-hand side of the write to file statement.
> That
> > is, the statement
> > f->$varname$ = (/ tmpvar /)
> > is overwriting the metadata for the file variable $varname$ in the file
> > pointed to by f. The attached script demonstrates the problem. This seems
> > like an ncl bug to me.
> >
> > Details of my script that seem to matter are:
> > 1) the file is NetCDF4
> > 2) the file variable whose metadata is getting overwritten has been
> defined
> > in the file but not written to yet
> > 3) the file variable whose metadata is getting overwritten does not have
> the
> > _FillValue attribute
> > 4) the variable on rhs of write to file statement has _FillValue
> attribute
> >
> > The problem happens with ncl 6.3.0 on yellowstone. It does not happen
> with
> > ncl 6.2.1, though with 6.2.1 the _FillValue gets added to the file
> > variable's metadata, which is unexpected to me.
> >
> > Keith
> >
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>
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