[gradsusr] Second derivative

[one weather]

Thank you so much for your help!!

2012/10/4 Jeff Duda <jeffduda319 at gmail.com>:
> change your last line to
> SECOND_DERIVATIVE = cdiff(dTX,x)/dx
>
> Although, there is a problem with representing dx using cdiff(lon,x).  Since
> the longitude change along a parallel is a function of longitude, you need
> to account for that to get a truly accurate second derivative in space.
> This will be especially problematic near the poles.
>
> Jeff Duda
>
> On Mon, Oct 1, 2012 at 2:02 PM, one weather <oneweather at gmail.com> wrote:
>>
>> Hello!!
>>
>> I would like to draw the second derivative of the temperature. Is
>> correct if I do this?
>>
>> >define dTX=cdiff(tmp2m,x)
>> >define dx=cdiff(lon,x)
>> >define SECOND_DERIVATIVE=(dTx/dx)/dx
>>
>> Thank you so much!!
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>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
>
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