Re: Documentation on String References

Hi Bruce,

Actually, there is an error in this documentation. Thanks for calling
attention to it. The function 'iscoord' takes two arguments, so the
code fragment should begin with:

if (iscoord(temperature,dimnames(0)) then

  At this point, once you know that dimnames(0) is a coordinate then
it must also be a dimension, so the following statements would yield
the same results
  assuming that dimnames(0) is actually the left-most dimension of the
temperature variable. However, this is not explicitly stated so it
cannot be guaranteed.

     coord0 = temperature&$temperature!0$
     ; or
     coord0 = temperature&$dimnames(0)$

Therefore the second statement would be more reliable. We will revise
this section of the reference manual.
  -dave

On Mar 1, 2010, at 2:09 PM, Lunde, Bruce N CIV NAVOCEANO, NP1 wrote:

> Hello,
>
> In following page on "String references"
>
> http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclVariables.shtml#StringRef
>
> should the last example concerning "dimnames()"
> make use of "dimnames()" in the line
>
> coord0 = temperature&$temperature!0$
>
> such as in
>
> coord0 = temperature&$dimnames(0)$
>
> or are you trying to show something else ?
>
> Thanks, Bruce
>
>
>
> String references
> Sometimes it is impossible to know the names of the attributes and
> coordinates before writing a script, or these names may vary from
> variable to variable. To solve this problem, string variables can be
> used to reference attributes and coordinates by enclosing the
> variable reference within dollar signs '$'. The following are
> examples of this:
> dimnames = (/"frtime","lat","lon"/)
> attnames = (/"_FillValue", "long_name"/)
>
> ;
> ; access to attribute
> ;
> att0 = temperature@$attnames(0)$
>
> ;
> ; Example of referencing a coordinate variable
> ; without knowing the dimension name
> ;
> if(iscoord(dimnames(0))
> coord0 = temperature&$temperature!0$
> end if
>
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Received on Mon Mar 1 16:14:21 2010