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eastblue
1 Posts |
 Posted - 06/16/2016 : 2:05:25 PM
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Origin Ver. and Service Release (Select Help-->About Origin): Origin 9.0.0(64-bit) SR2
Operating System: Window 7
In the origin, there is a menu (under analysis-data manipulation) called "subtract reference data". It seems to work okay when I try to subtract backgrounds from my original data. I, however, do not understand the algorithm to fully trust the result. Especially, I wonder how you can subtract background when the x points of original data and background data are different.
Could anyone have any idea about the subtract algorithm? Thank you in advance.
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Chris D
428 Posts |
Posted - 06/16/2016 : 2:33:24 PM
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Hi,
According to our documentation:
"When the two datasets' coordinates differ, the two curves will be interpolated or extrapolated with linear interpolation before subtraction occurs."
Here are the docs on the subtract_ref X-Function that is called when you choose Subtract Reference fro the menu:
http://www.originlab.com/doc/X-Function/ref/subtract_ref
Here are docs on interpolation/extrapolation:
http://www.originlab.com/doc/Origin-Help/Math-Inter-Extrapoltate-YfromX#Algorithm
It basically performs the same as our Simple Curve Math tool (mathtool X-Function) but automatically sets the operator to subtract.
You can view the docs about that here: http://www.originlab.com/doc/Origin-Help/Math-SimpleColumnCurveMath
That page states:
"If X range for input and reference X is identical,operations perform on the corresponding Y range for input and reference directly.
If X range for input and reference is different , operations perform on the corresponding Y range for input and reference after the XY range interpolation or extrapolation. In addition:
If the option Use Common Range Only has been checked, the X values in Result is consist of all X values in sharing range, while the corresponding Y values are calculated after interpolation (extrapolation)."
Thanks,
Chris Drozdowski
Originlab Technical Support
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Edited by - Chris D on 06/16/2016 2:48:51 PM |
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how does "subtract reference data" work