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MatthieuB
Canada
7 Posts |
 Posted - 05/06/2009 : 1:27:58 PM
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Hello,
I have plotted a colorfill plot to represent a phase diagram. I then showed the contour line when the level is equal to 0 to represent my phase boundary. I was wondering if there was a way to export a contour line into a worksheet because I would like to fit it with a function.
Help would be greatly appreciated,
Matt |
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larry_lan
China
Posts |
Posted - 05/07/2009 : 10:22:35 AM
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Hi Matt:
I think there are no such interface for users to get the contour lines directly (or maybe I dont know). But u can do this workaround:
First of all, I suppose your original data is in XYZ form. To plot a counter graph, u need to convert XYZ data into matrix, right? (P.S, if you plot countour from XYZ directly, please do XYZ gridding to get the matrix).
Basically, when converting the XYZ into matrix, u need to export more columns and rows, say a 100 x 100, or a 1000 x 1000 matrix. Actually, when Origin plot the countour lines, it runs some interpolation algorithms in back to evaluate the data points on the lines. By exporting a large matrix, u can get more data points which close to the contour level you want -- 0.
Al ha, now u need to convert this matrix back into XYZ column, using "Matrix --> Convert to Worksheet". And then open "Worksheet --> Extract Worksheet Data", extract data that "-0.01 < Z < 0.01". That's the data u want.
Larry |
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MatthieuB
Canada
7 Posts |
Posted - 05/08/2009 : 2:30:13 PM
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Thank you Larry,
I have done what you said but now I am having difficulties with the "extract worksheet data" function. I may be putting in my conditions wrong or perhaps am using it incorrectly because when I do my test select if true either all the cells are selected or none are. It also seems that origin help does not provide much help with this issue. Could you perhaps help me out with this?
Thank you so much,
Matt |
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larry_lan
China
Posts |
Posted - 05/10/2009 : 10:13:32 PM
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Hi Matt:
Supposed you already have the XYZ worksheet data:
Then bring up the Extract Worksheet Data dialog, follow these steps:
If no data was extracted, may be you need to widen the condition like "C > -0.1 AND C < 0.1".
Hope this helps.
Larry |
Edited by - larry_lan on 05/10/2009 10:15:39 PM |
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MatthieuB
Canada
7 Posts |
Posted - 05/18/2009 : 12:37:38 PM
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Thank you very much greatly appreciated. Excellent explanation and neat trick.
Matt |
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minimax
348 Posts |
Posted - 05/18/2009 : 2:21:17 PM
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Hi,
We will try to make up with a faster mthod to access it in the next version, probably 8.1.
Max
OriginLab Technical Support |
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Topic |
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Contour plots and contour lines