[R] Derivative of a function

[S Ellison]

If you just want the value of the derivative at a particular point, would numerical derivatives suffice? If so, try (for example) the numDeriv package.

S
________________________________________
From: r-help-bounces at r-project.org [r-help-bounces at r-project.org] On Behalf Of Lisa [lisajca at gmail.com]
Sent: 29 June 2011 21:35
To: r-help at r-project.org
Subject: Re: [R] Derivative of a function

Yes. I need to do implicit differentiation. After rearrangement, I got

(x2 – x1) * b = log(1 / y - 1)

Take derivative of both sides with respect to y, I have

(x2 – x1) * b’[y] = - 1/y(1-y)

Since both (x2 – x1) and b’[y] are vectors, I cannot move (x2 – x1) to
RHS. This is why I posted my question here to see if there is some R
functions or some idea that can help me solve this problem. Thanks.

Lisa


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