[ncl-talk] Attribute multi-dimension segfault

[Rick Brownrigg]

Hi Kyle,

Yes, I can reproduce this, and in other ways as well.  It does seem like a
bug, and I'll file a ticket on it.

Do you have a work-around for the time being?

Thanks for reporting this...
Rick


On Fri, Dec 18, 2015 at 9:35 AM, Kyle Griffin <ksgriffin2 at wisc.edu> wrote:

> Hi all,
>
> Interesting little problem when trying to read colors assigned to
> attributes. A Nx4 array of colors can be assigned but not properly
> subscripted. Given the code below:
>
> ares = True
> ares at cnLineColors = read_colormap_file("BlRe")
>
> I then tried three different operations.
> 1) print(ares at cnLineColors) ----> results in full Nx4 array output on
> screen.
> 2) print(ares at cnLineColors(0:10,:) ----> Warning that attributes are only
> one dimension (not a true statement), no output
> 3) print(ares at cnLineColors(0:10) -----> Segfault, no warning received, in
> contrast to most other attempts to read with wrong number of subscripts.
>
> Warning is received as expected if indices exceed dimensions, regardless
> of dimensions included/referenced in the subscripts.
>
> Seems like this may have been overlooked at some point. Further, is
> support for any 2+ dimensioned attributes an intended feature?
>
> Full output for cases 1-3 below.
>
>
> Kyle
>
>
>  Copyright (C) 1995-2015 - All Rights Reserved
>
>  University Corporation for Atmospheric Research
>
>  NCAR Command Language Version 6.3.0
>
>  The use of this software is governed by a License Agreement.
>
>  See http://www.ncl.ucar.edu/ for more details.
>
> ncl 0> ares=True
>
> ncl 1> ares at cnLineColors = read_colormap_file("BlRe")
>
> ncl 2> print(ares at cnLineColors(0:10))
>
> Segmentation fault (core dumped)
>
>
>  Copyright (C) 1995-2015 - All Rights Reserved
>
>  University Corporation for Atmospheric Research
>
>  NCAR Command Language Version 6.3.0
>
>  The use of this software is governed by a License Agreement.
>
>  See http://www.ncl.ucar.edu/ for more details.
>
> ncl 0> ares=True
>
> ncl 1> ares at cnLineColors = read_colormap_file("BlRe")
>
> ncl 2> print(ares at cnLineColors(0:10,:))
>
> fatal:Attributes only have one dimension, 2 subscripts used
>
> fatal:["Execute.c":8573]:Execute: Error occurred at or near line 2
>
>
> ncl 3> print(ares at cnLineColors)
>
> (0,0) 0
>
> (0,1) 0
>
> (0,2) 0.5019608
>
> (0,3) 1
>
> (1,0) 0
>
> (1,1) 0
>
> (1,2) 0.5215687
>
> (1,3) 1
>
> (2,0) 0
>
> (2,1) 0
>
> (2,2) 0.5411765
>
> (2,3) 1
>
> .......
> ----------------------------------------
> Kyle S. Griffin
> Department of Atmospheric and Oceanic Sciences
> University of Wisconsin - Madison
> Room 1407
> 1225 W Dayton St, Madison, WI 53706
> Email: ksgriffin2 at wisc.edu
>
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