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ClemensObergfell
Germany
12 Posts |
 Posted - 11/06/2014 : 08:06:56 AM
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Origin Ver. and Service Release (Select Help-->About Origin): 9.0.0G (32-Bit) SR1
Operating System: Windows 7 Corporate
Dear Origin-Support Team,
After trying several things like the non linear curve fit tool with the built in "find y from x" as well as spline interpolation where you get back a new set of data, I found the Interpolate X or Y.ogw template.
This template was exactly what I wanted to do, but I have a problem with it.
After importing the X and Y data columns, I type several values into the Y out column, hit find X, and I get values back, but they are totally not on the curve.
Find Y from given X data works fine, but the other way round it doesn't.
I have put some screenshots into this post, so you can see my problem.
Why does it interpolate like a negative linear function?
What could I do, to make the template find the correct X values to given Y values and is it possible to find multiple x values for one Y value?
Thank you very much for your help in advance.
Clemens
This is the example where I typed in X values and found the correct Y values:
This is the example where I used the Y values from before and hit "Find x":
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Edited by - ClemensObergfell on 11/06/2014 08:32:10 AM |
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greg
USA
1378 Posts |
Posted - 11/06/2014 : 10:06:45 AM
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If it is true that your Input X and Y values are monotonically increasing, then the problem is that this tool cannot be used for extrapolation. It is only designed for interpolation. You can only enter X or Y values which are within the input x or y range of values.
If you plot your input XY does it look like a function? Perhaps exponentially increasing? If so, then you should fit the data with an appropriate function and choose the option to generate Find X From Y and Find Y From X tables in the Find X/Y page.
http://www.originlab.com/Index.aspx?go=Support/VideoTutorials&pid=1767 |
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ClemensObergfell
Germany
12 Posts |
Posted - 11/06/2014 : 10:20:54 AM
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Thank you for your reply. The plot is NOT monotonically increasing. Does it have to be?
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greg
USA
1378 Posts |
Posted - 11/06/2014 : 2:05:55 PM
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X must be sorted either ascending or descending in order for Find Y to work properly.
Y must be sorted either ascending or descending in order for Find X to work properly.
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ClemensObergfell
Germany
12 Posts |
Posted - 11/07/2014 : 02:14:39 AM
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Ok, I didn't got this from the video tutorial. Thanks for the information!
Maybe you could add this to the tutorial.
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Topic |
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Problem with Interpolate X or Y.ogw Template