Thank you to all who have made great suggestions. Both Gabor and David's
methods work well for me. I see now where I was going wrong with this, I
wasn't loading it to a function. I also did not know expression could be
used in that way.
Thank you very much for your help!
Katrina
On Fri, Nov 18,
On Thu, Nov 17, 2011 at 4:40 PM, Katrina Bennett wrote:
> Hello, I am wondering if someone can help me. I have the following function
> that I derived using nls() SSlogis. I would like to find its derivative. I
> thought I had done this using deriv(), but for some reason this isn't
> working out f
I think you need to make an expression. I tried
> nls.fn <- asym/((1+exp((xmid-x.seq)/scal)))
Error: object 'asym' not found
> nls.fn <- expression(asym/((1+exp((xmid-x.seq)/scal
> D(nls.fn,"asym")
1/((1 + exp((xmid - x.seq)/scal)))
>
Does that help? Maybe there are other approaches too.
JN
On Nov 17, 2011, at 4:40 PM, Katrina Bennett wrote:
Hello, I am wondering if someone can help me. I have the following
function
that I derived using nls() SSlogis. I would like to find its
derivative. I
thought I had done this using deriv(), but for some reason this isn't
working out for me
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