Re: Surfaces & pictures

[Fausto Arinos de A. Barbuto]

On 18-05-2015 05:32, Helios de Rosario wrote:

> I think we do, if I understood Faustino's question correctly. Say we
> have this 50x50 RGB image (a cyan cross):
>
> img = ones(50,50,3);
> img(1:51:50^2) = 0;
> img(50:49:50^2) = 0;
>
> It can be projected onto a 50x50 surface just like this:
>
> surf(sombrero(50), img)
>
> You can use "imread" to read the image from the file into a matrix.

Thanks, but it did not work. I forgot to say I'm using Octave 3.8.1 on
a Ubuntu 14.04-64 installation.  The list of packages I have using are:

              bim *|   1.1.3 | /usr/share/octave/packages/bim-1.1.3
        dataframe  |   1.1.0 | /home/fausto/octave/dataframe-1.1.0
     econometrics  |   1.1.1 | /home/fausto/octave/econometrics-1.1.1
        financial  |   0.4.0 | /home/fausto/octave/financial-0.4.0
              fpl *|   1.3.4 | /usr/share/octave/packages/fpl-1.3.4
          general *|   1.3.4 | /usr/share/octave/packages/general-1.3.4
         geometry *|   1.7.0 | /usr/share/octave/packages/geometry-1.7.0
               io *|   2.0.2 | /usr/share/octave/packages/io-2.0.2
   linear-algebra  |   2.2.1 | /home/fausto/octave/linear-algebra-2.2.1
    miscellaneous *|   1.2.0 | /usr/share/octave/packages/miscellaneous-1.2.0
missing-functions *|   1.0.2 | 
/usr/share/octave/packages/missing-functions-1.0.2
              msh *|   1.0.6 | /usr/share/octave/packages/msh-1.0.6
           odebvp  |   1.0.6 | /home/fausto/octave/odebvp-1.0.6
           odepkg *|   0.8.4 | /usr/share/octave/packages/odepkg-0.8.4
            optim  |   1.4.0 | /home/fausto/octave/optim-1.4.0
         parallel  |   2.2.0 | /home/fausto/octave/parallel-2.2.0
             plot *|   1.1.0 | /usr/share/octave/packages/plot-1.1.0
          splines *|   1.2.6 | /usr/share/octave/packages/splines-1.2.6
           struct  |  1.0.10 | /home/fausto/octave/struct-1.0.10

Fausto