[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Piecewise function in octave
From: |
Ben Abbott |
Subject: |
Re: Piecewise function in octave |
Date: |
Wed, 15 Oct 2008 18:54:43 -0400 |
".*" is element by element multiplication, where "*" is matrix
multiplication.
f = @(t) a(t) .* (t<t0) + b(t) .* (t==t0) + c(t) .* (t>t0);
For example,
octave-3.1.51+:1> a = @(t) -1;
octave-3.1.51+:2> b = @(t) 0;
octave-3.1.51+:3> c = @(t) 1;
octave-3.1.51+:4> f = @(t,t0) a(t) .* (t<t0) + b(t) .* (t==t0) +
c(t) .* (t>t0);
octave-3.1.51+:5> t = (-10):10;
octave-3.1.51+:6> x = f(t,0);
octave-3.1.51+:7> x
x =
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 0 1 1 1 1 1
1 1 1 1 1
octave-3.1.51+:8> x = f(t,3)
x =
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 0 1 1
1 1 1 1 1
Ben
On Oct 15, 2008, at 5:42 PM, genehacker wrote:
Hi Carlo,
Can you please tell what .* do to the equation. Also how would
you write
a generalised piecewise function like
f(t) = a(t) t < t0
b(t) t = t0
c(t) t > t0
thanks in advance,
k3.
Carlo de Falco-2 wrote:
On 15/ott/08, at 21:57, genehacker wrote:
Hi,
I am looking for a code that can specify a function f(t)
piecewise, i.e.
that can be defined according to intervals based on value of t. I
want to
integrate one of these in an anonymous function g(x,t).
f(t) = sin(t) t<pi
0 t>=pi
cheers
k3
to implement the example above you could use
f = @(t) sin(t) .* (t<pi) ;
c.
_______________________________________________
Help-octave mailing list
address@hidden
https://www-old.cae.wisc.edu/mailman/listinfo/help-octave
--
View this message in context:
http://www.nabble.com/Piecewise-function-in-octave-tp20002314p20003062.html
Sent from the Octave - General mailing list archive at Nabble.com.
_______________________________________________
Help-octave mailing list
address@hidden
https://www-old.cae.wisc.edu/mailman/listinfo/help-octave