...@gmail.com]
Sent: 29 June 2011 21:35
To: r-help@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
On Wed, Jun 29, 2011 at 4:35 PM, Lisa wrote:
> 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
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 quest
On 30/06/11 06:16, Gabor Grothendieck wrote:
On Tue, Jun 28, 2011 at 10:03 PM, Lisa wrote:
Dear all,
I just want to get the derivative of a function that looks like:
y = exp(x1*b) / (exp(x1*b) + exp(x2*b))
where y is a scalar, x1, x2, and b are vectors. I am going to take the
derivative of b
On Tue, Jun 28, 2011 at 10:03 PM, Lisa wrote:
> Dear all,
>
> I just want to get the derivative of a function that looks like:
>
> y = exp(x1*b) / (exp(x1*b) + exp(x2*b))
>
> where y is a scalar, x1, x2, and b are vectors. I am going to take the
> derivative of b with respect to y, but I cannot de
On Jun 29, 2011, at 10:48 AM, Lisa wrote:
This is not a homework. I just want to see if there are some R
functions or
some ideas I can borrow to solve my problem.
There is a deriv function that provides limited support for symbolic
differentiation.
The Rhelp list is advertised ( http://
This is not a homework. I just want to see if there are some R functions or
some ideas I can borrow to solve my problem.
--
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Sent from the R help mailing list archive at Nabble.com.
__
(1) You really ought to do your own homework.
(2) What has this to do with R?
cheers,
Rolf Turner
On 29/06/11 14:03, Lisa wrote:
Dear all,
I just want to get the derivative of a function that looks like:
y = exp(x1*b) / (exp(x1*b) + exp(x2*b))
where y is a scalar, x1, x2, and
Dear all,
I just want to get the derivative of a function that looks like:
y = exp(x1*b) / (exp(x1*b) + exp(x2*b))
where y is a scalar, x1, x2, and b are vectors. I am going to take the
derivative of b with respect to y, but I cannot derive an expression in
which b is function of y. I know there
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