[ncl-talk] replace_zerovalue_or_negativevalue_to_NaN

[Kunal Bali]

Hello Guido

Thanks for the information. I just need to know the information regarding
polygon query, if you remember. Have you tried to solve it because I am
still unable to sort out that query ?



Kunal Bali







On Sun, Jun 12, 2016 at 3:56 PM, Guido Cioni <guidocioni at gmail.com> wrote:

> Kunal,
> you can easily achieve that with the *where* function
> http://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml.
> Assuming that var is your variable and var_mod the new one, you can do
> this (var need an attribute _FillValue, which is equivalent to NaN):
>
>    var_mod = *where*(var.le.0, var at _FillValue, var)
>
> There’s a method to do the same in CDO and NCO but it is more complicated.
> If you just need the variable in NCL I would suggest you to use the where
> function, while if you need to write another file you can try to load it in
> NCL with the “w” option. If that doesn’t work then you will have to use CDO
> and NCO, but that would be a question not relevant to ncl-talk :)
>
> Guido Cioni
> http://guidocioni.altervista.org
>
> On 12 Jun 2016, at 11:16, Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
> Dear NCL users
>
> I have a file having zero and negative values. I need to replace it with
> NaN values.
> Could anyone let me know how to do it ?
>
> Regards
> Kunal Bali
>
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