Calculating area

[horatiu]

Can I calculate with gnuplot the area under a graph. In MS Excel I add the results of (x value) * (y value ). Can I do something like that with gnuplot or there are other tools for calculating the area under a graph?
Thanx

[Hans-Bernhard Bröker]

horatiu wrote:
> Can I calculate with gnuplot the area under a graph.

Depends on the graph. ;-p

If it's a function plot, have a look at the 'bivariat.dem' example
script that came with the program.

 > In MS Excel I add the
> results of (x value) * (y value ).

... I hope you don't, because that is *not* going to give you the area
under the graph.




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[warpino]

Of course that's not going to give the area. But I'm interested in knowing if there's a way as well.

In excel I do a trapezoidal integration sum(i) ((x(i+1)-x(i))*(y(i+1)+y(i))/2) . How can I do the same wiht gnuplot on a data set?

Thanks,

w.

Hans-Bernhard Bröker wrote:

horatiu wrote:
> Can I calculate with gnuplot the area under a graph.

Depends on the graph. ;-p

If it's a function plot, have a look at the 'bivariat.dem' example
script that came with the program.

 > In MS Excel I add the
> results of (x value) * (y value ).

... I hope you don't, because that is *not* going to give you the area
under the graph.




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Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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