[ncl-talk] Segmentation fault when reading variables from NC

[Alex Schaefer]

Feng,

I got the same seg fault that you got with your file.  My guess is something is just not quite right with that file.  The size of that  domain should not be an issue.  My ncl 6.1.2 is compiled from source so the precompiled binary theory affecting it is not the case.  I am not sure what other things will spit out seg faults so Dennis will have to take lead.

Sorry I couldn’t be of more help,
-Alex


On Mar 23, 2015, at 9:51 PM, ChenFeng <fengfengabc003 at 163.com> wrote:

> And I use the  pre-compiled binary version which is downloaded from the NCAR website.
>  
> From: ChenFeng
> Date: 2015-03-24 11:47
> To: Dennis Shea; alexander.schaefer
> CC: ncl-talk
> Subject: Re: Re: [ncl-talk] Segmentation fault when reading variables from NC
> Thanks Dennis and Alexander
> The reason I use the printVarSummary(lon2d) is only want to make sure whether the code above this line is correct.
> There is no problem when I use this code to read another geo_em.d01.nc file. So I think there is something wrong with the NC file. But I can use ncdump to see the structure and find nothing special.
> Is the variable dimention too large (474*524)?  But I have also use this ncl version to read variables more large than this.
> I attached the file. Could you please help me check it with another ncl version and platform.
> Thanks.
>  
> Feng
>  
> From: Dennis Shea
> Date: 2015-03-23 22:40
> To: ChenFeng
> CC: ncl-talk
> Subject: Re: [ncl-talk] Segmentation fault when reading variables from NC
> Also, forgot to mention ...
> 
> Using named dimensions should only be done when reordering an array. Nothing wrong with doing so but is is  less efficient than ..
> 
> lon2d = inp0->XLONG_M (0, :, :)
> 
> On Mon, Mar 23, 2015 at 8:11 AM, Dennis Shea <shea at ucar.edu> wrote:
> I don't understand why either.  6.1.2 is no longer available here so I can not test with 6.1.2
> 
> When it does work ... what does printVarSummary(lon2d) indicate?
> 
> On Mon, Mar 23, 2015 at 2:47 AM, ChenFeng <fengfengabc003 at 163.com> wrote:
> Hi ncl-users,
>  
> I have encounted an error when reading a variable from an NC file.
> the code is listed below:
> ;************************************************
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> ;************************************************
> begin
>   inp0 = addfile("/public/home/chenf/AHWRF/TEST/WPSwks.T02/geo_em.d01.nc","r")
>   lon2d = inp0->XLONG_M (Time|0, south_north|:, west_east|:)
>   printVarSummary(lon2d)
> ;************************************************
> end
>  
> the error message is:
>  Copyright (C) 1995-2013 - All Rights Reserved
>  University Corporation for Atmospheric Research
>  NCAR Command Language Version 6.1.2
>  The use of this software is governed by a License Agreement.
>  See http://www.ncl.ucar.edu/ for more details.
> Segmentation fault (core dumped)
>  
> The strange thing is when i'm reading the variable without any dimention name cited, the error disappeared.
> The code changes into :
> ;************************************************
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> ;************************************************
> begin
>   inp0 = addfile("/public/home/chenf/AHWRF/TEST/WPSwks.T02/geo_em.d01.nc","r")
>   lon2d = inp0->XLONG_M
>   printVarSummary(lon2d)
> ;************************************************
> end
>  
> I don't understand why. It is very appreciate if anybody can tell me the reason.
> Thanks.
>  
> Feng
> 
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