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sagar
USA
6 Posts |
 Posted - 11/19/2001 : 3:39:29 PM
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Hi,
I have random XYZ data for which I need to generate 3D surface plot. (XY values correspond to a position of wafer and Z value is current). Now, some XY values are
missing. When I convert this data to random
I have to use either correlation or weighted
average. But what I am interestd is generating a surface plot where I can see "holes" for missing data points.
Further, since my wafer is circular in nature, certain points (e.g. X,Y = 0,0) are non-existent. So I should be able to see a "circular surface". However, Origin converts it to matrix and it is, by definition, rectangular.
So my questions here are:
1. Is there any way to show "voids" for missing values?
and
2. How do I get rid of non-existent values
from the matrix data? (e.g. edges on a wafer
as mentioned above).
Thanks a lot for your help.
Regards,
Sagar |
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easwar
USA
1965 Posts |
Posted - 11/19/2001 : 5:34:04 PM
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Hi Sagar,
If the matrix has missing values (cell contains the text '-'), then these cells should show up as holes in a 3D Colormap Surface Plot. You can enter missing values in matrix cells by typing 0/0 in the cell. As for cells "outside" of your "circular wafer", if these have missing values, the surface should appear "circular".
When you convert your XYZ data using random conversion, the conversion process fills in cell values for cells where x,y pairs are missing in your data. This is why the surface appears rectangular and you do not see any holes either.
In Origin 7.0 (http://www.originlab.com/www/products/origin7/index.asp), we are adding a few new worksheet-to-matrix conversion algorithms. A couple of new random conversion algorithms based on the NAG library are being introduced. Also, a sparse conversion algorithm is being added that takes your x,y,z data as is and fills them into matrix cells, filling missing values for cells that did not have data. This may work well for you.
Can you please send us a sample data file (or Origin OPJ) for us to look at? You can send it to tech@originlab.com and mention "Attn: Easwar" in the subject line.
Thanks,
Easwar
OriginLab.
Edited by - easwar on 11/19/2001 17:34:40 |
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Avoiding missing values in 3D plot