[ncl-talk] Understanding where statement

[Guido Cioni]

	function where (
		condtnl_expr  ,    
		true_value    ,    
		false_value        
	)

NCL is reading your condition like "where delz>= 0.5 then replace delz with its own value", thus nothing changes. Maybe you want to change the order of the conditions?

>     DELZ =where(delz.ge.0.5,delz at _FillValue,delz)


What you wrote is basically "removing" all the values less than 0.5 by substituting them with fill value which is 0.5. Thus, it makes sense that the minimum of your array is 0.5 

> On 24. Dec 2017, at 17:13, Barry Lynn via ncl-talk <ncl-talk at ucar.edu> wrote:
> 
> Hi:
> 
> I have the lines:
> 
>     delz at _FillValue = 0.5
>     DELZ =where(delz.ge.0.5,delz,delz at _FillValue)
>     print("DELZ")
>     printMinMax(DELZ,False)
> min=0.500002   max=2.36552
> 
> I don't understand why DELZ is still > 0.5.
> 
> Thank you for your suggestions,
> Happy Holidays
> -- 
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science, 
> The Hebrew University of Jerusalem, 
> Givat Ram, Jerusalem 91904, Israel 
> Tel: 972 547 231 170
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> 
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Guido Cioni
http://guidocioni.altervista <http://guidocioni.altervista/>.org

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