How to find the volume from a set of 500 datas?

J K
2013 4 3
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Inside a 2 stroke engine, I have a set of data of crank angle and pressure, which is huge (500). And I need to find the volume of the cylinder,
given by: http://www.flickr.com/photos/52175884@N08/8616297620/in/photostream
I know the value of Vd, theta, r and R.
I already import the data into Matlab.
http://www.flickr.com/photos/52175884@N08/8615190019/in/photostream
My problem is how can I write the matlab code so that I can get the plot of Pressure and theta?

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Mahdi
Mahdi 2013-4-3
编辑：Mahdi 2013-4-3
Is the data that you show the pressure and theta values?
Side note: I suggest that you give your filenames more descriptive titles than "equation", "exercise", and "E".
J K
J K 2013-4-3
Yes, the left side is the theta, and the right column is the pressure.

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Mahdi
Mahdi 2013-4-3

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plot(Data(:,1), Data(:,2))

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Mahdi
Mahdi 2013-4-3
Sorry, use
plot(data(:,1), data(:,2))
I used a different variable name than what you had.
J K
J K 2013-4-4
THank you.
But how to show on the title on the axis?
Mahdi
Mahdi 2013-4-9
I assume you want to add a title to the plot? After using the plot line, type
title('What you want the title to be')

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