Re: Do functions always strip their results from any attributes?

From: wxtofly <wxtofly_at_nyahnyahspammersnyahnyah>
Date: Fri Jan 14 2011 - 11:35:04 MST

There is a trick you can use though...
Example 1:

myvar = a float variable with attribute @description defined.
mynewvar=myvar ; this transfers all the attributes and descriptions
                               ; then change the values
 
mynewvar = round(myvar,3) => mynewvar is an integer variable with no @description.

Caveat is that you must want/expect dimensions to match.

TJ Olney


On 01/12/2011 02:36 PM, Emilie Vanvyve wrote:

Hello,

I have noticed that when I use functions (at least some of them), the end result has lost all traces of attributes.

Example 1:
myvar = a float variable with attribute @description defined.
mynewvar = round(myvar,3) => mynewvar is an integer variable with no @description.

Example 2:
myvar = a variable with attribute @units defined.
mynewvar = ndtooned(myvar) => mynewvar doesn't have any @units attribute.

The second case is a bit more annoying when it comes down to handling date/time variables. Most time handling functions require the @units attribute to be defined in order to function correctly (e.g. ut_string). One needs to redefine each time the @units attribute before using the function.

I was wondering why this is happening. Is any function intrinsically a "value-only" assignment as explained here http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclVariables.shtml#Assignment?

Emilie

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Received on Fri Jan 14 11:35:15 2011