[gradsusr] How to define a variable that is 1 if one parameter OR another parameter is in a certain range?

[Goodson,Ron [Edm]]

reading what I wrote .. meant to say

field of 1 or 0 for cape>500 && li <-2
field of 1 or 0 for prate > 20

.. then add the two together and if >1 (eg 1 or 2) .. use that to
simulate the OR.

but you probably figured that out ...

good luck

ron



-----Original Message-----
From: gradsusr-bounces at gradsusr.org
[mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Stefan Gofferje
Sent: June 11, 2013 1:41 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] How to define a variable that is 1 if one
parameter OR another parameter is in a certain range?

Hmmm, could that be so easy? I'm going to test.

On 06/11/2013 06:28 PM, Goodson,Ron [Edm] wrote:
> if you have a field for which it is 1 or 0 for (cape>500) and other 
> field of 1 or 0 for (li<-2) (using maskout and const) .. why not just 
> add these together and if the result is > 1 ... make it = 1 ?
> 
> would that work. 
> 
> 
> ron	
> 
> 
> 
> -----Original Message-----
> From: gradsusr-bounces at gradsusr.org
> [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Stefan Gofferje
> Sent: June 11, 2013 3:55 AM
> To: GrADS Users Forum
> Subject: Re: [gradsusr] How to define a variable that is 1 if one 
> parameter OR another parameter is in a certain range?
> 
> Hi Jeff,
> 
> I thought about that but unfortunately, that doesn't work because I 
> don't only plot the information. I also evaluate the parameter in 
> another script to trigger actions and evaluating multiple parameter in

> that script would get pretty nesty soon.
> There must be some mathematical way to express this in a define 
> expression...
> 
> -Stefan
> 
> On 06/10/2013 07:42 PM, Jeff Duda wrote:
>> Stefan,
>> Define two separate fields, one for each side of the disjunction.  
>> Just make sure to use the same color table for both displays so that 
>> in the end it appears you are displaying just one field.
>>
>> Jeff Duda
>>
>>
>> On Mon, Jun 10, 2013 at 2:54 AM, Stefan Gofferje <stefan at saakeskus.fi

>> <mailto:stefan at saakeskus.fi>> wrote:
>>
>>     Hi,
>>
>>     how would one define a variable that is 1 if one parameter OR
> another
>>     parameter is in a certain range?
>>
>>     I have found a way of expressing "AND" by masking out values,
then
>>     const'ing them and const'ing them again, resulting in a result of
> 1 if
>>     the variable is in the desired range, e.g. cape>500 and li<-2 in
> this
>>     case. When I then simply multiply the 2 expressions, I get 1 if
>>     expression 1 AND expression 2 are within the desired range and 0
> (or U)
>>     if either of them isn't.
>>
>>     'define tstorm =
>>     const(const(maskout(cape255_0mb,cape255_0mb-500),1.0),0,-u)*
>>     const(const(maskout(no4lftxsfc,(-1*no4lftxsfc)-2),1.0),0,-u)'
>>
>>     Now, how would I express e.g. ((cape>500 AND li<-2) OR prate>20)
> in a
>>     similar way?
>>
>>     Ideas, anyone?
>>
>>     -Stefan
>>
>>     _______________________________________________
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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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> 
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