Thanks for showing me how to use genD correctly and that it matches deriv
here. Like you say, there must be a problem with the manual way of doing
it, and I will look at it closely. Thanks again.
spencerg wrote:
>
> Hi, Paul:
>
>
> Your example is so complicated that I don't want to
You could also use rSymPy to symbolically differentiate it. For example,
based on the semi-automatic differentiation example on the rSymPy home
page:
http://code.google.com/p/rsympy/#Semi-Automatic_Differentiation
just replace the indented lines there with the indented lines here
(I've also added
Hi, Paul:
Your example is so complicated that I don't want to take the time
to check it. You apply "deriv" to an exponential divided by a sum of
exponentials, and I'm not convinced that your manual "Correct way" is
actually correct. It looks like you've followed the examples in the
"
Hi Spencer,
Thanks for suggesting the genD function. In attempting it, I have
rearranged my function from phat1 ~ ... to ... - 1, it apparently doesn't
like the first one :) But when I run it, it tells me the partials are all
zero. I'm trying out a simple MNL equation before I expand it to what
Thank you for suggesting other functions, I will look into them.
When I read the deriv() function, it did mention partial, but I (being a
newbie) wasn't able to get partials for a simple MNL equation. I'm sure I
did something wrong then, but here's what I tried the following and got
different an
Have you considered genD{numDeriv}?
If this does not answer your question, I suggest you try the
"RSiteSearch" package. The following will open a list of options in a
web browser, sorted by package most often found with your search term:
library(RSiteSearch)
pd <- RSiteSearch.fun
On May 10, 2009, at 10:05 AM, Paul Heinrich Dietrich wrote:
Quick question:
Which function do you use to calculate partial derivatives from a
model
equation?
I've looked at deriv(), but think it gives derivatives, not partial
derivatives.
Your reading of the help page and the examples d
rsity
Ph. (410) 502-2619
email: rvarad...@jhmi.edu
- Original Message -
From: Paul Heinrich Dietrich
Date: Sunday, May 10, 2009 4:45 pm
Subject: [R] Partial Derivatives in R
To: r-help@r-project.org
> Quick question:
>
> Which function do you use to calculate partial deri
Quick question:
Which function do you use to calculate partial derivatives from a model
equation?
I've looked at deriv(), but think it gives derivatives, not partial
derivatives. Of course my equation isn't this simple, but as an example,
I'm looking for something that let's you control whether
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