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 Simple code for obtaining first derivative		  New Topic  Reply to Topic
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Wendy_Yang

USA
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Posted - 05/15/2009 :  3:53:08 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): Origin7 SR4
Operating System: Windows XP

I would like to differentaite one dataset and write the result into a new dataset. How do I write the codes in OriginC? For example, I have a worksheet named "Data1". There are 3 columns: X, Y and Deriv. I have X and Y filled with data, and would like to differentiate Y and put the derivative data in Deriv. So I start with:

Dataset dsX("Data1_X");
Dataset dsY("Data1_Y");
Dataset dsDeriv("Data1_Deriv");

How do I proceed from there? By the way, the codes need to be part of a user-defined function.

Thanks!

Iris_Bai

China
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Posted - 05/27/2009 :  02:21:02 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Wendy,

In Origin7 you can use this function

int Curve_derivative( curvebase * pcrvData, curvebase * pcrvResults, int nOrder = 1, double dSmoothness = BSPLN_OFF, Dataset * pdsWeights = NULL )


Example code:

void test_Curve_derivative()
{
	Curve crvData("Data1_X", "Data1_Y");
	Curve crvResult("Data1_X", "Data1_Deriv");
	crvResult.SetSize(crvData.GetSize());
	
	int nOrder = 1;
	Curve_derivative(&crvData, &crvResult, nOrder);	
}


Iris
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