issue with dividing the integer by 0

Hi again,

I'm calculating the normalized root mean square error, and the code
crashes, because for slp for the particular station equals 0. In my code I
tried to fix it, but it didn't work. Please have a look and give any
suggestions on how I can make it work. Thanks.

Here's what comes as the program was running:

pacman 1991% ncl rmse-normalized.ncl

 Copyright (C) 1995-2011 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
(0) ------ SELAWIK------
(0) Calculating for Temperature
(0) Std dev: 8.30892
(0) ::: 0.825233
(0) Calculating for Dewpoint
(0) Std dev: 213.946
(0) ::: 1.01504
(0) Calculating for WindSpeed
(0) Std dev: 3.18798
(0) ::: 1.03146
(0) Calculating for WindDir
(0) Std dev: 206.94
(0) ::: 0.755161
(0) Calculating for Sea-Level-Pres
(0) Std dev: 0
(0) ::: -999
At line 100 of file writematrix.f
Fortran runtime error: No such file or directory

-- 
regards
*******************************************************
*Alexander Semenov*
*
*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks
930 Koyukuk dr, 408c3
Fairbanks, AK, USA, 99775
work phone +19074742672

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