Date: Jan 28, 2013 11:17 AM
Author: Steven Lord
Subject: Re: 2 parameter quadl

"maia " <antonietta.arista@yahoo.com> wrote in message

news:ke0hhv$avo$1@newscl01ah.mathworks.com...

> can i use quadl for blow function

> f=@(x,y) (a*x+b*y);

>

> if i want integrate it due to only x how should i write it?

>

> like this

>

> quad(f, x ,0,pi)

For a fixed value of y, you mean?

y = 2;

quad(@(x) f(x, y), 0, pi);

Symbolically, leaving y unevaluated so you receive a function of y? You will

need to define x and y as a symbolic value then use the _symbolic_

integration routine INT.

syms x y

newf = f(x, y)

int(newf, x, 0, pi)

This assumes that your function is only using operations that are defined

for symbolic variables.

--

Steve Lord

slord@mathworks.com

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