Re: Shade region between curves

[Shane Gibney]

Rob,

Should:

patch( [x, x(end:-1:1)], [x.^2, x(end:-1:1).^4] , [1 0 0])

actually plot the two curves? Is Octave-forge needed?

The manual just says:

patch () [Function File]
patch (x, y, c) [Function File]
patch (x, y, c, opts) [Function File]
patch (’Faces’, f, ’Vertices’, v, . . . ) [Function File]
patch (. . . , prop, val) [Function File]
patch (h, . . . ) [Function File]
Chapter 15: Plotting 205
h = patch (. . . ) [Function File]
Create patch object from x and y with color c and insert in the current axes object.
Return handle to patch object.
For a uniform colored patch, c can be given as an RGB vector, scalar value referring
to the current colormap, or string value (for example, "r" or "red").

Thanks,

Shane

2009/5/19 Xin Dong <xdong.cn@gmail.com>

Hi Rob,

Can you explain x(end:-1:1)? What does that mean?

Thanks,
Xin

On Tue, May 19, 2009 at 12:25 PM, Rob Mahurin <address@hidden> wrote:

On Tue, May 19, 2009 at 3:48 PM, ofeyrpf <address@hidden> wrote:
> Is it possible with Octave to shade a region between two graphs?

On May 19, 2009, at 11:17 AM, Michael Goffioul wrote:
> What you're probably looking for is called "area".

"area" shades between a curve and the x-axis.  You can shade between
two curves with "patch":

octave:13> x = linspace(0,1.5);
octave:14> patch( [x, x(end:-1:1)], [x.^2, x(end:-1:1).^4] , [1 0 0])

There may be an easier way that other people know about.

Rob

--
Rob Mahurin
Department of Physics and Astronomy
University of Tennessee                 865 207 2594
Knoxville, TN 37996                     address@hidden

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