[ncl-talk] Wondering how to write this if statement

[Barry Lynn]

Hi:

My apologies for not making that clear, but I thought it was obvious that
the if statement was comparing array values.

I am hoping there is a more direct way to do this comparison than doing a
loop, index by index.

Thank you helping to clarify the programming issues.  Much appreciated.

Barry



On Fri, Sep 8, 2017 at 11:32 AM, Marston Johnston <shejo284 at gmail.com>
wrote:

> Hi,
>
>
>
> One of the first rules of programming is to READ the error statement.
>
>
>
> In your case there is nothing wrong with the IF statement per se. The
> problem is that you do not understand what you are asking the IF statement
> to do. As you have written it, the IF statement needs a scalar (single
> value) or a boolean logical (true or false) in order to get the correct
> execution.
>
> You are obviously passing an array of the sorts to the if statement.
>
>
>
> When posting to NCL, it helps if you print out the meta data for the
> variables you are having trouble with (printVarSummary).
>
> When checking the elements of an array you need to loop over the elements
> 1 at a time – if that is what you are trying to do.
>
> It is difficult for us to know what you are trying to do without a good
> explanation from you.
>
>
>
> /M
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Marston S. Ward, PhD
>
> Department of Earth Sciences
>
> University of Gothenburg, Sweden
>
> Email: marston.johnston at gu.se
>
> SkypeID: marston.johnston
>
> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>
> Only the fruitful thing is true!
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>
> *From: *Barry Lynn <barry.h.lynn at gmail.com>
> *Date: *Friday, 8 September 2017 at 10:01
> *To: *Marston Johnston <shejo284 at gmail.com>
> *Cc: *ncl-talk <ncl-talk at ucar.edu>
> *Subject: *Re: [ncl-talk] Wondering how to write this if statement
>
>
>
> Hi:
>
>
>
> Thank you (but)...
>
>
>
> It doesn't -- is there another "trick" we're leaving out?
>
>
>
> I think there is another way to write it where you condition it, rathern
> than use an if statement.
>
>
>
> fatal:Conditional statements (if and do while) require SCALAR logical
> values, see all and any functions
>
> fatal:["Execute.c":8575]:Execute: Error occurred at or near line 41 in
> file ./radar_2.ncl
>
>
>
> On Fri, Sep 8, 2017 at 10:35 AM, Marston Johnston <shejo284 at gmail.com>
> wrote:
>
> As far as I can see that should work:
> if(dbz.lt.0.0) then
>
> Dbz = dbz + 256.0
>
> end if
>
>
>
> /M
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Marston S. Ward, PhD
>
> Department of Earth Sciences
>
> University of Gothenburg, Sweden
>
> Email: marston.johnston at gu.se
>
> SkypeID: marston.johnston
>
> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>
> Only the fruitful thing is true!
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>
> *From: *ncl-talk <ncl-talk-bounces at ucar.edu> on behalf of Barry Lynn <
> barry.h.lynn at gmail.com>
> *Date: *Friday, 8 September 2017 at 09:33
> *To: *ncl-talk <ncl-talk at ucar.edu>
> *Subject: *[ncl-talk] Wondering how to write this if statement
>
>
>
> Hi:
>
>
>
> I am wondering how to properly write this if statement in NCL language.
>
>
>
>   if (dbz.lt.0)then
>
>    dbz = dbz + 256
>
>   end if
>
>
>
> --
>
> 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
> Fax: (972)-25662581
>
>
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108 <(914)%20432-3108>
>
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>
>
>
>
>
> --
>
> 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
> Fax: (972)-25662581
>
>
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108 <(914)%20432-3108>
>



-- 
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
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
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