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 f(x) = derivative vs 1st derivative		  New Topic  Reply to Topic
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rastei

France
2 Posts
Posted - 10/19/2017 :  09:04:23 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Why values in col C and D are different?

arstern

USA
237 Posts
Posted - 10/19/2017 :  09:29:33 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,


1) The derivative function:
http://www.originlab.com/doc/LabTalk/ref/Derivative-func


2) The derivativeXY function:
http://www.originlab.com/doc/LabTalk/ref/DerivativeXY-func
If you use derivativeXY function in the F(x) dialog, you will obtain the same value as in column D.

When you use Analysis -> Mathematics -> Differentiate, this method automatically uses the derivativeXY function because you have a corresponding xy dataset col(A(X)) and col(B(Y)). If you delete col(A(X)) and then calculate the derivative by using the differentiate dialog box, the dialog box will then calculate by using the derivative(vd) function rather than derivativeXY function.

-Aviel
OriginLab
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