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mattcschmidt
USA
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 Posted - 12/06/2007 : 2:18:41 PM
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Origin Version (Select Help-->About Origin): 7.5
Operating System: xp
I am trying to map out data from an irregular shape semiconductor sample. I have power data (z) in an xy spatial grid over the sample. However, when I convert the data into a matrix it seems that I must use some sort of a smoothing function, such as "renka-cline".
The problem is that there are some xy coordinates that don't have data, because the sample is not a perfect rectangle (physically no sample in parts of the rectangular grid). Also, there are some devices on the wafer that don't work so they don't have any data. Origin takes these null points and treats them like zeros. The "renka-cline" function and others use all of these zeros to create a data set that isn't really representative. I end up getting a slope down to zero at the edge of the wafer as well as spots on the wafer that did not have a working device.
So, I would like to be able to do two things:
1) get origin to simply ignore null data points (devices in the sample that don't work)
2) get origin to not "smooth" down to zero (edge of the irregular shaped sample; I want the data to just stop at the edge and jump directly to zero)
I suppose a fix for 1 could be to simply put in a number that was the average of those around it, but this is not ideal.
Any help would be very appreciated.
Thanks,
matt |
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cpyang
USA
1406 Posts |
Posted - 12/06/2007 : 8:48:09 PM
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If your sample does not have holes, Origin 8 has a new graph type called XYZ contour, where a matrix is not used at all and contour plot is generated directly from XYZ data and the XY data's natural boundary is used, so things should work automatically for you in Origin 8. This new plot also support separate XY data as custom boundary so even holes can be shown if needed.
CP
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larry_lan
China
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Posted - 12/06/2007 : 9:04:35 PM
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Hi Matt:
The XYZ gridding method does not convert missing values to zero, but trim them when gridding. As CP mentioned, contour plot in Origin 8 supports "Layer Boundary" and "Data Boundary", such as:
You can download an Origin 8 Demo on out website (www.originlab.com) to evaluate this feature.
Thanks
Larry
OriginLab Technical Services |
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contour plots: ignoring null data