Re: Generic type converter

Dave,

Let me think how hard that will be, and where should we implement it.

Thanks,

wei

huangwei@ucar.edu
VETS/CISL
National Center for Atmospheric Research
P.O. Box 3000 (1850 Table Mesa Dr.)
Boulder, CO 80307-3000 USA
(303) 497-8924

On May 17, 2012, at 9:25 PM, Dave Allured wrote:

> Wei,
>
> Yes I have used the toxxx functions. Those are flexible about the
> type of the input argument. I need to be flexible about the type of
> the function output. Following one of my examples, "data_type" is not
> known in advance, and it changes for different iterations within the
> same program run:
>
> y = type_convert (x, data_type)
>
> Therefore I can not hard code any of the toxxx functions unless they
> are enumerated within a group of "if data_type" statements. In this
> particular application, the type of "x" can not be propagated either,
> because it is the result of separate calculations of unrelated data
> type.
>
> --Dave
>
> On Thu, May 17, 2012 at 8:49 PM, Wei Huang <huangwei@ucar.edu> wrote:
>> Dave,
>>
>> Have you tried the toxxx functions?
>> where xxx can be: double, float, string, int, short, long, etc.
>>
>> for example, y = tofloat(x) will convert any NCL type of x which
>> can be converted to float to y as float.
>>
>> On May 17, 2012, at 4:26 PM, Dave Allured wrote:
>>
>>> All,
>>>
>>> To support some generic data processing, I would like to find a
>>> numeric type converter that takes a numeric (or double) input, and
>>> converts to a numeric type specified by a string "type" argument such
>>> as argument 2 of the "new" function. For example:
>>>
>>> y = type_convert (x, "float")
>>>
>>> Or more generically, what I am really trying to do:
>>>
>>> y = type_convert (x, data_type)
>>>
>>> Where "data_type" is a string containing the name of any legal NCL data type.
>>>
>>> The following does not work for some output types, because NCL checks
>>> for loss of precision in assignments, a valuable feature.
>>>
>>> y = new (1, data_type)
>>> y = x
>>>
>>> Does anyone know a nice way to do this without a stack of if
>>> statements? I did not find anything like this on the type converters
>>> page. Thank you.

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Received on Thu May 17 22:58:11 2012