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 Area under a curve

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T O P I C    R E V I E W
l203 Posted - 06/27/2006 : 09:59:47 AM
Origin Version (Select Help-->About Origin): origin 7.5 (demo)
Operating System:XP

I was wondering if there is a way to get origin to tell you the area under each of a group of curves that I fit to some data?

Thanks,
Eric
1   L A T E S T    R E P L I E S    (Newest First)
larry_lan Posted - 06/28/2006 : 12:15:11 AM
Hi Eric:

You can right click the fitted curve and chose "Go To xxx" to active the hidden fitted curve data worksheet. And then plot a curve by the fitted data, active the graph, click Analysis-->Calculus-->Integrate from the menu, then you can see the area from the result log.

If you dont want to generate a new fitted curve plot, you can do these by Labtalk scripts. Supposed the fitted curve worksheet named 'PolyFit1', and the second column is Y column, type the following script in the command window:

integ PolyFit1_B;
integ.area=;

to get the area.

If there are lots of curves, just included the script in a loop, like:

win -a wksname;
for(ii=2; ii<=10; ii++)
{
integ Col($(ii));
integ.area=;
}

Hope it helps

Larry
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