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 Curve substraction		  New Topic  Reply to Topic
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ning

USA
2 Posts
Posted - 05/02/2002 :  4:26:21 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello, I am new user of Origin 6.0. Can anybody tell me how to substract a curve.

Let's say I have two curve, I want to use one curve to be the baseline. so the second curve needs to substract the baseline curve and then get another new curve after baseline substraction.

How can I do this ..

thanks..

easwar

USA
1965 Posts
Posted - 05/02/2002 :  6:23:09 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

There is more than one way to do this. Perhaps the one most suitable for you is to use the Origin Baseline Tool (menu item: Tools->Baseline). In the Baseline Tool, you can specify your second dataset as the baseline dataset, then hit the Create Baseline button, and then hit the Subtract button. This does replace the first curve with the result of the subtraction. To keep the original curve, you could keep a copy of that dataset.

Origin's scripting language, LabTalk, can be used to create a custom script for your needs as well.

Easwar
OriginLab.
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ning

USA
2 Posts
Posted - 05/03/2002 :  6:17:25 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
but my problem is that the two curve have mismatched X value, but I would like to have the Y value of one curve substract the Y value of the other curve. However, the X-values of the two curves are different.
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cpyang

USA
1406 Posts
Posted - 05/03/2002 :  6:34:37 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Labtalk support subtraction of two dataset with automatic interpolation, assuming that
"Data1" is your raw data and "Base" is your baseline worksheet and each has A(X) and B(Y), and you want to put the subtraction result into Data1_C, then the follow script will do the trick, assuming that you have plot Data1_B and Base_B into a graph

 
data1_c = data1_b;
data1_c - Base_B;

the result is put back into data1_C and interpolation on Base_B automatically applied.

if you do, instead,

data1_C -= Base_B;

then there is no interpolation, and the two dataset must match in X values
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