Re: plot.m using __plt__,m

[Shai Ayal]

Henry,

if you would have looked at __plt__.m you would see that it calls 
__pltopt__ which calls __plotopt1__ which does the actual work. This is 
called procedural programming, and the above example shows that it is not 
always good to use it :)

the use of __ in many some programming languages (C,C++) means these 
functions are "internal", not to be used by normal users under normal 
conditions. I suppose this is the meaning here too.

Shai

p.s. a good way to see the code of an m-file is using the "type" command, 
e.g. type __pltopt__

Henry F. Mollet wrote:
> On previous octave version (2.1.46) I had used posted changes for
> "__pltopt1__.m" so I could use "k" for a black line.
>
> On new eMac with Octave 2.1.71 I wanted the same changes. I thought the
> changes were to be made in plot.m and I accidentally found that the changes
> were to be made in __pltopt1__.m.
>
> How could I have determined from the code in plot.m (see below) that it was
> using __pltopt1__.m to do the actual plotting? I only see __plt__ .
>
> Also, what is the meaning of "__" before and after the name of the function,
> in this case pltopt1?
> Henry
>
> function plot (varargin)
>
>   ## XXX FIXME XXX -- these plot states should really just be set
>   ## temporarily, probably inside an unwind_protect block, but there is
>   ## no way to determine their current values.
>
>   __gnuplot_set__ nologscale;
>   __gnuplot_set__ nopolar;
>
>   __plt__ ("plot", varargin{:});
>
> Endfunction
>
> function fmt = __pltopt1__ (caller, opt)
> CUT
> % Changes needed for color black:
>     %elseif (strcmp (char, "w") || strcmp (char, "k"))  % Nov 21 2004
>     elseif (strcmp (char, "k"))             % Nov 21 2004
>         set_color = 1;                    % Nov 21 2004
>         color = "-1";                    % Nov 21 2004
>     elseif (strcmp (char, "w"))                % Nov 21 2004
> CUT
> endfunction
>
>
>
>
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--
Shai Ayal, Ph.D.
Head of Research
BioControl Medical BCM
3 Geron St.
Yehud 56100
ISRAEL
Tel:  + 972 3 6322 126 ext 223
Fax:  + 972 3 6322 125
email: address@hidden



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