Re: turn off the colors in a matrix plot

[soren]

Quoting Kamaraju S Kusumanchi <address@hidden>:

> I have a matrix, say
>
> octave:94> f=[1 2 3 4; 0 1 2 3; -1 0 1 2]
> f =
>
>    1   2   3   4
>    0   1   2   3
>   -1   0   1   2
>
> and I would like to plot this matrix as a surface using the row index and
> column index as the x, y values. That is my points in the 3-D plot would be
>
> (1,1, 1) (1,2,2) (1,3,3) (1,4,4)
> (2,1, 0) (2,2,1) (2,3,2) (2,4,3)
> (3,1,-1) (3,2,0) (3,3,1) (3,4,2)
>
> Currently I am doing this by
>
> octave:95> NX=3; NY=4; [yy, xx] = meshgrid([1:NY],[1:NX]), f=[1 2 3 4; 0 1 2
> 3; -1 0 1 2], mesh(xx, yy, f), xlabel("x"), ylabel("y")

Can't you just do:
  mesh (f)
?
If you want to change the colors I think you can just change the  
colormap. And if you just want to plot point, look at the 'plot3'  
function.

Søren
> This gives me the correct plot as desired. However, the values are plotting
> with color coding in them (red to blue). Is there any way to turn off the
> colors? Is there any option to remove the lines and just plot the points?
>
> Also, I would appreciate if someone could provide an elegant way to solve
> the above problem of plotting the matrix. Right now, my solution looks very
> round about way of doing it with all the reordering of x, y coordinates
> etc., Any suggestions?
>
> thanks
> raju
> --
> Kamaraju S Kusumanchi
> http://www.people.cornell.edu/pages/kk288/
> http://malayamaarutham.blogspot.com/
>
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