# [ncl-talk] A NCL Mystery Solved

Marston Johnston shejo284 at gmail.com
Thu Oct 19 08:31:46 MDT 2017

```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

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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