SciDAVis / SciDAVis Bugs / #323 Problems with bar plots when a table contains only one row with X,Y data

#323 Problems with bar plots when a table contains only one row with X,Y data

Milestone: next

Status: open

Owner: nobody

Labels: None

Priority: 4normal

Updated: 2018-09-30

Created: 2018-01-12

Creator: Fellype

Private: No

On Linux:
If you try to create a bar plot from a table with only one row with X,Y data SciDAVis crashes.
The crashes also occurs:
- if you delete data from a table in order to leave only one row with a X,Y pair
- if you try to add (using Alt + C) to an existing graph with bar plot another bar from a table with only one row with X,Y data

the terminal output is:
ASSERT failure in QVector<T>::operator[]: "index out of range", file /usr/lib/qt/include/QtCore/qvector.h, line 355
Aborted

What occurs on Windows is a little bit more difficult to describe:
Try to add (using Alt + C) to an existing graph with bar plot another bar from a table with only one row with X,Y data, if the X value of the added bar is larger than that present in the existing graph the graph will be messy.

The problems occurs using both vertical and horizontal bars.

2 Attachments

bar_plot_from_multiple_tables-created_with_LINUX_build.sciprj

bar_plot_from_multiple_tables-created_with_windows_build.sciprj

Discussion

Fellype - 2018-01-12

Attachments has changed:

Diff:

--- old +++ new @@ -1 +1,2 @@ bar_plot_from_multiple_tables-created_with_LINUX_build.sciprj (6.9 kB; application/x-sciprj) +bar_plot_from_multiple_tables-created_with_windows_build.sciprj (6.9 kB; application/x-sciprj)
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High Performance Coder - 2018-01-14

I don't get a crash. Using scidavis-1.22 for OpenSUSE Tumbleweed.

scidavis-example.png

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- Fellype - 2018-01-15
  
  This screenshot you attached is not of a bar plot.
  
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  - High Performance Coder - 2018-01-15
    
    On Mon, Jan 15, 2018 at 01:45:10PM -0000, Fellype wrote:
    
    This screenshot you attached is not of a bar plot.
    
    Sorry about that. I don't know what happened to the actual screenshot
    I saved...
    
    --
    
    Dr Russell Standish Phone 0425 253119 (mobile)
    Principal, High Performance Coders
    Visiting Senior Research Fellow hpcoder@hpcoders.com.au
    Economics, Kingston University http://www.hpcoders.com.au
    
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Alexander Ploumistos - 2018-01-15

Can't reproduce it either. I'm using 1.22 on Fedora 27, x86_64.

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gbm - 2018-01-15

I don't get a crash, either (Fedora, current git code).
The ASSERT failure you get points to an 'out of range' error.
Checking the code for bar plots I found some possible 'out of range' bugs.
Try attached patch.

problem_with_bar_plots_from_tables_with_one_row.patch

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- Fellype - 2018-01-16
  
  Dear gbm,
  The patch you provided fix the crashes here (on Slackware 14.2).
  Now the current issue is reduced only to the second part - the messy graphs.
  Best regards.
  
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Fellype - 2018-01-16

BTW,
The crashes looks to affect only Slackware builds (both 32 and 64 bits). I've tested it on Ubuntu 16.04 with no crashes. But the problem with messy graphs occurs.

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gbm - 2018-01-16

The SciDAVis code for vertical bar plots gets the bar width for a plot curve by calculating the minimum of the x-coordinate difference between consecutive curve points (i.e. consecutive rows in table).
For a curve with only one row (point), there is no way to obtain that minimum, and the abs(x-coordinate) of the single point is taken as bar width.
Unless a global bar width is implemented I don't see a better way to obtain the bar width for a one point curve.

bar_plot_sample.sciprj

bar_plot_sample1.png

bar_plot_sample2.png

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High Performance Coder - 2018-09-30

Group: 1.22 --> next
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