[ncl-talk] Issue with cd_inv_calendar return values

[Saji Hameed]

Hi Kyle,

Thanks.

> How are you calling cd_inv_calendar in your code? Are you certain that
partial days (e.g., hours, minutes, and/or seconds not equal to 0) aren't >
being fed into the function?

There is no issue with the parameters that I pass on to cd_inv_calendar,
but one can never be absolutely sure. The hours, minutes and seconds are
always 0 in my case.  Since then I have switched back to ut_inv_calendar
and do not face the same problem again.

> I've used this function countless times with "hours since xxx" and "days
since xxxx" and never experienced the issue you are describing.

Sure - this happens rarely. I guess it  must be some kind of memory leak
issue. The funny thing is that I am not able to simulate this "error"
by using a test script.

saji

On Wed, Jul 22, 2015 at 11:13 PM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Hi Saji,
>
> How are you calling cd_inv_calendar in your code? Are you certain that
> partial days (e.g., hours, minutes, and/or seconds not equal to 0) aren't
> being fed into the function? I've used this function countless times with
> "hours since xxx" and "days since xxxx" and never experienced the issue you
> are describing.
>
>
> Kyle
>
> ----------------------------------------
> Kyle S. Griffin
> Department of Atmospheric and Oceanic Sciences
> University of Wisconsin - Madison
> Room 1421
> 1225 W Dayton St, Madison, WI 53706
> Email: ksgriffin2 at wisc.edu
>
> On Tue, Jul 21, 2015 at 6:32 AM, Saji Hameed <saji.nh at gmail.com> wrote:
>
>> Dear NCL developers,
>>
>> I have a library that uses cd_inv_calendar for some critical parts. Once
>> in a blue moon, my
>> script crashes due to problems with values returned by cd_inv_calendar.
>> Instead of returning
>> a whole number (for example 37785 days since 1900-01-01 return value is
>> double), it sometimes returns a fraction (37784.xxxx).
>>
>> I use NCL version 6.3.0 on a Linux box.
>>
>> It is quite difficult to reproduce this issue because it happens rarely
>> and randomly. I notice that
>> http://www.ncl.ucar.edu/current_release.shtml#KnownBugs6.3.0  notes a
>> bug with cd_calendar when the units are specified as "minutes since" or
>> "seconds since".  In my case the units are
>> "days since 1900-01-01".
>>
>> I will use ut_calendar for the time being, but thought that I would
>> notify the developers about this issue.
>>
>> saji
>>
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