[ncl-talk] A NCL Mystery Solved

[Marston Johnston]

Hi Barry,

 

A couple things, not to be nit-picky but just my experience. I rewrote the script a bit. But I’m confused, your arrays are always empty so Hits_1 will always be 0.

This version of the script doesn’t give the error:

 

begin

  n_days  = 3

  dims = 9

  Hits_1 = new(n_days,"float")

  Hits_4km = new(n_days,"float")

  Hits_1 = 0.0

  Hits_4km = 0.0

  do ii_day = 0,dims-1

    if (ii_day .eq.0)then

      i_day = 0

    else

      i_day = (mod(ii_day,3))

    end if

    ;printVarSummary(i_day)

    ;print("i_day = "+ i_day)

    Hits_1(i_day) = Hits_4km(i_day) + Hits_1(i_day)

    print(Hits_1(i_day))

  end do

end

 

/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 

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: Thursday, 19 October 2017 at 16:18
To: ncl-talk <ncl-talk at ucar.edu>
Subject: [ncl-talk] A NCL Mystery Solved

 

Hi:

 

I have this error (it didn't obviously show up with a Google search).

 

fatal:Assign: Hits_1 is undefined, can not subscript an undefined variable

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 17 in file ./test.ncl

Before defining Hits_1 as an array of size n_days, I needed the : to do the sum.  

However, it is the : that causes the error when the variable is defined as an array.

I am not sure why, but I thought I would make a note of it for those who encounter the same error message.

 

begin

  n_days  = 3

  dims = 9

  Hits_1 = new(n_days,float)

  printVarSummary(Hits_1)

  Hits_4km = new(n_days,float)

  Hits_1 = 0

  Hits_4km = 0

  do ii_day = 0,dims,1

   if (ii_day .eq.0)then

   i_day = tointeger(0)

   else

   i_day = (mod(ii_day,3))

   end if

   printVarSummary(i_day)

   print("i_day = " + i_day)

    Hits_1(i_day) := Hits_4km(i_day) + Hits_1(i_day) ; remove colon if Hits_1 is defined as an array.

  end do

end

 

 

-- 

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

 

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