Re: color choice in plotting

[Henry F. Mollet]

Thanks for clarification as I thought that I had to learn the lower-level
plotting. I do have a potential contribution with regard to 3d plotting to
be able to use mesh (x,y,z) instead of gsplot (z).

octave:17> z
z =
   1   1   1   1   1
  10  10  10  10  10
   5   5   5   5   5

gsplot (z) gives exactly what I'd like with respect to visually comparing
the matrix z (in 2-dimensions) with the 3d plot. When using MATLAB-style 3d
commands, and again looking at z above, I have to use mesh (x,y,z') to get
the equivalent of gsplot (z). They are not exactly the same as the colors
are reversed and in the gsplot x and y start at 0. The meshgrid was created
using x=[1,2,3] and y = [1,2,3,4,5]. Nothing else seemed to work for me to
get the equivalent of gsplot(z).
Henry



on 1/9/04 2:00 PM, John W. Eaton at address@hidden wrote:

> On  9-Jan-2004, Henry F. Mollet <address@hidden> wrote:
> 
> | Yes, but how is to be done using gnuplot-style plotting (if it can be called
> | that) as per Octave manual and as per original question?
> | Say we use: 
> | octave:7> x = [0:pi/50:10]';
> | octave:8> data = [x, sin(x), cos(x)];
> | octave:9> gplot data with lines, data using 1:3 with points
> | 
> | sin (x) is red, cos(x) is green and we'd like both to be the same color of
> | our choice.
> | 
> | octave:10> gplot data with lines, data using 1:3 with points linetype 1
> | error: `linetype' undefined near line 10 column 51
> | error: evaluating plot style command
> 
> This has come up many times, and the answer is that Octave does not
> support "linetype" as an option to gplot and probably never will.  The
> problem is that since Octave has to parse the command, it creates a
> maintenance problem when gnuplot changes (the linetype option was not
> always a part of gnuplot, for example).
> 
> I expect that gplot and gsplot and all of that other gnuplot-specific
> interface will eventually be removed from Octave.  So you should
> probably be using the higher-level plot functions if possible.  If you
> find that you can't do everything you want with those, then please
> help to improve Octave so that there will be no need for gplot,
> gsplot, etc.  Sorry that this is not documented in an obvious place
> (yet).
> 
> jwe



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