| T O P I C R E V I E W |
| viva746 |
Posted - 12/17/2003 : 02:56:32 AM
hi,
i don't know how to transform 3 columns (containing x,y,z data) to a 3d surface plot. Origin 7.5 suggests to convert the data to a matrix, but there are so many possibilities (direct, regular xyz, sparse xyz,..). Which is the correct one?
thanks |
| 1 L A T E S T R E P L I E S (Newest First) |
| edgar.kaiser |
Posted - 12/17/2003 : 05:03:59 AM
It depends on your data which gridding process is to be applied:
- If your x-y-data fit into a equidistant grid, you can do regular conversion
- If the upper condition is fulfilled but a number of grid points are missing, you need sparse conversion.
- If your x-y-pairs are not regularly spaced you will need random conversion. There are a number of random gridding procedures, you will need to experiment and find out which one and which parameters give the best representation.
Origin pro 7.0 only provides interpolating gridding procedures. If you need an approximation (least squares fit) you need to change to NAG procedures which provide a Marquardt-Levenberg approximation using 2D-cubic-Bsplines.
Maybe Origin 7.5 already provides approximative gridding methods, I don't know.
You can find some more comprehensive information in the Origin help.
Best regards,
Edgar |
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