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ClemensObergfell
Germany
12 Posts |
 Posted - 02/03/2015 : 10:27:48 AM
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Origin Ver. and Service Release (Select Help-->About Origin): 9.0.0 G (32-Bit) SR1
Operating System: Windows 7 Enterprise
Hello Origin Support Team,
I have a problem with differentiation of spline data.
So:
the 2 examples have the same data origin, but in one I used "Spline" and in the other I used "B-Spline".
The main difference is the number of points in the spline data.
The "Spline" data has around 200 rows, whereas the "B-Spline" data has around 850 rows over the same x-section.
NOW: If I differentiate the spline data sets, I get a smooth curve for the "Spline" differentiation, but I get a rough curve for the "B-Spline" differentiation.
Is it possible to adjust the number of data points I get from the B-Spline? Otherwise I would like to know, how I could transform the B-Spline dataset in a new column, where I just copy every other fifth value.
Thank you in advance for your help.
Greetings, Clemens
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Shirley_GZ
China
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Posted - 02/04/2015 : 01:44:37 AM
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Hi,
You can use the Interpolate tool(opened by selecting Analysis: Mathematic: Interpolate/Extrapolate... from main menu) to create the spline and B-spline curve. With this tool, you can specify the number of data points as below.
Originlab Technical Service Team |
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ClemensObergfell
Germany
12 Posts |
Posted - 02/05/2015 : 09:22:18 AM
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Thank you for the suggestion, I did know about this tool, but at first I only got the y-values out of it. I then changed the output from "(<autoX>,<neu>)" to "(<neu>,<neu>)" so I got the x-values too.
In the end I solved my problem with an fft smoothing over the rough curve. That was the easiest way to get good results without generating a lot of new data I already had.
Thanks again.
Greetings |
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Spline data differentiation