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Thread Subject: Find integral under three points

Subject: Find integral under three points

From: Brian

Date: 23 Jan, 2008 22:57:21

Message: 1 of 2

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I have a table of values. I have 360 points, but for example..
J=[1,5;2,8;3,11];

How do I find the area under these three points? I've tried using the quad function, but I can't seem to get it right. Is there a better way?

Subject: Re: Find integral under three points

From: Roger Stafford

Date: 24 Jan, 2008 00:06:27

Message: 2 of 2

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Brian <acct1112003@yahoo.com> wrote in message
<24666116.1201129072686.JavaMail.jakarta@nitrogen.mathforum.org>...
> I have a table of values. I have 360 points, but for example..
> J=[1,5;2,8;3,11];
>
> How do I find the area under these three points? I've tried using the quad
function, but I can't seem to get it right. Is there a better way?
--------
Use 'trapz' for trapezoidal integration. If trapezoidal integration is not
sufficiently accurate for your purposes, there are some methods on the Matlab
Central File Exchange that give higher order approximations.

Roger Stafford

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