From help-octave-request at bevo dot che dot wisc dot edu  Thu Apr 27 12:36:27 2000
Subject: Re: plotting a spline
From: Kai Habel <kai dot habel at gmx dot de>
To: "help-octave at bevo dot che dot wisc dot edu" <help-octave@bevo.che.wisc.edu>
CC: David DS Barnes <d dot d dot barnes at ic dot ac dot uk>
Date: Thu, 27 Apr 2000 19:39:50 +0200

David DS Barnes wrote:
> 
> Hi All,
> 
> sorry to ask a lowbrow question like this,
> 
> but can anyone tell me how to plot a set of points with a spline or
> curve,
> rather than as a line?
>
Hello David,

take a look at Paul Kienzle's signalPAK Toolbox[1], there you can find
the
functions spline.m and interp1.m.

If you want to interpolate your data points using a cubic spline you
can do.

#create example data
x=rand(1,11);
y=0:0.1:1.0;

#100 new points
xi=linspace(0,1,100);
yi=interp1(x,y,xi,'spline');
#plotting
plot(x,y,'bo');
hold on
plot(xi,yi);
hold off

HTH, Kai

[1] http://users.powernet.co.uk/kienzle/signalPAK/index.html

-- 
Kai Habel
mailto:kahacjde at linux dot zrz dot tu-berlin dot de



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