I have a data curve with discrete time points that I imported into MATLAB. The x axis is an array named t:(adsbygoogle = window.adsbygoogle || []).push({});

The y axis named Cp:Code (Text):t =

1.0e+003 *

0.0319

0.0505

0.0851

0.1037

0.1356

0.1648

0.2021

0.2313

0.3616

0.5823

0.8880

1.1778

1.4996

1.7814

The plot of the curve looks like this:Code (Text):Cp =

1.0e+004 *

0.0077

0.7846

3.7077

3.2923

1.8769

1.3769

1.0539

0.7769

0.5462

0.3923

0.2692

0.1846

0.1462

0.1385

[PLAIN]http://dl.dropbox.com/u/11932911/Cp.jpg [Broken]

Essentially I want to integrate the function from zero to one of the time points. I tried using the functions quad and trapz but they seem to return red error messages. The function trapz works when I integrate over the entire curve (trapz(Cp)) but it won't let me specify an integration interval.

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# Integrating a Discrete Function in MATLAB

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