Fix to allow 'compare_versions.m' handle version numbers ending with period

[Ben Abbott]

On Monday, January 26, 2009, at 01:42PM, "Muthiah Annamalai" <muthuspost at gmail.com> wrote:
>Hello there,
>
>I built Octave from sources (3.1.51+) and my gnuplot interface failed, 
>for the following
>reason: __gnuplot_version__() returns 4.2. in my computer, and 
>compare_versions.m
>script doesnt recognize version numbers ending with a "." as you can see 
>from the
>runs below.
>
>__gnuplot_version__()
>ans = 4.2.

We should look more closely at __gnuplot_version__ as well. There may be a bug here.

What do you get when you type the following?

    [status, output] = system (sprintf ("%s --version", gnuplot_binary ()))

I get

    status = 0
    output = gnuplot 4.2 patchlevel 4 

__gnuplot_version__ replies  "4.2"

I would have expected to get 4.2.4.

Ben