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ibvmt

Switzerland
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Posted - 07/15/2005 :  09:56:07 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: XP pro

What is the OriginC equivalent for the Labtalk interpolation and the necessary declarations?
e.g.: StatData_v=AWData_v(StatData_skm);
I couldn't find it anywhere.

Thanks
Peter

easwar

USA
1965 Posts
Posted - 07/15/2005 :  10:26:05 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Peter,

There is a global function: Origin C Language Reference->Global Functions->Analysis->Curve_xfromY
that you can find in the help files.

This function is the equivalent of the LabTalk () method of finding interpolated values. Note that this function will be sensitive to the line connection type if the data is graphed and you have changed the line connection type from straight to B-spline, Spline etc. If no graph, or no change to connection type, the default of linear interpolation is used.

Also one could call the NAG library function for spline interpolation if you are interested. You can find sample code here:
http://www.originlab.com/index.aspx?s=9&lm=71&pid=268

Easwar
OriginLab
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ibvmt

Switzerland
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Posted - 07/18/2005 :  05:06:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Easwear

I found the function.
In my case I would have to use Curve_yfromx.
This function returns a double value.
So I would have to include it in a loop over all datapoints.
The Labtalk equivalent does it in a one line command for the whole data column.

Thanks
Peter
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