Re: where function

Sorry -- ignore the last line after my name.
 -dave

On Jan 6, 2013, at 1:12 PM, David Brown wrote:

> Hi Ahmad,
> You really should at least tell us what the error message says.
> However, you are using attribute syntax for what look like coordinate arrays.
> The simplest approach would be to use coordinate array syntax (untested)
>
> tmp = alkali ; create a tmp variable with same coordinate arrays as alkali
> tmp = 0 ; set all the values to 0
> tmp({25:50},{-5:5}) = alkali({25:50},{-5:5})
> akali = tmp
> delete(tmp) ; get rid of the tmp variable
>
> -dave
>
> alkali = where((alkali&conc.ge.25 .and. alkali&conc.le.50 .and. alkali&ionm.ge.-5 .and. alkali&lonm.le.5), alkali, 0)
>
>
> On Jan 6, 2013, at 4:30 AM, Ahmad Farsyud wrote:
>
>> Hallo NCL,
>>
>> I have a simple question related "where" logic in NCL.
>>
>> I have a data containing this information:
>> variable : float alkali( conc, ionm)
>> "conc" extends from 1.0 to 100.0
>> "ionm" extends from -10 to +10
>>
>> i want to display only alkali values in specific range conc|25:50 and ionm|-5:5 while the rest values outside the range, I want to replace with zero "0".
>>
>> I did something like this:
>>
>> alkali = where((alkali@ conc.ge.25 .and. alkali@conc.le.50 .and. alkali@ ionm.ge.-5 .and. alkali@ionm.le.5), alkali, 0)
>>
>> but, i got error message!
>>
>> Thanks for your help.
>>
>> Ahmad
>>
>>
>>
>> On Sun, Jan 6, 2013 at 8:02 PM, Ahmad Farsyud <a.farsyud@gmail.com> wrote:
>> Hallo NCL,
>>
>> I have a simple question related "where" logic in NCL.
>>
>> I have a data containing this information:
>> variable : float alkali( conc, ionm)
>> "conc" extends from 1.0 to 100.0
>> "ionm" extends from -10 to +10
>>
>> i want to display only alkali values in specific range conc|25:50 and ionm|-5:5 while the rest values outside the range, I want to replace with zero "0".
>>
>> I did something like this:
>>
>> alkali = where((alkali@ conc.ge.0.1 .and. alkali@conc.le.0.4 .and. alkali@ ionm.ge.-1 .and. alkali@ionm.le.-10), alkali, 0)
>>
>> but, i got error message!
>>
>> Thanks for your help.
>>
>> Ahmad
>>
>> _______________________________________________
>> ncl-talk mailing list
>> List instructions, subscriber options, unsubscribe:
>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Sun Jan 6 13:22:19 2013