Ben Bolker bbol...@gmail.com
on Sat, 1 Dec 2012 21:49:47 + writes:
Martin Maechler maechler at stat.math.ethz.ch writes:
[snip]
but definitely *no* need to use a function from an extra
CRAN package .. as someone else ``erronously'' suggested.
Note that
but definitely *no* need to use a function from an extra CRAN
package .. as someone else ``erronously'' suggested.
Except that Matlab's interp1() 'cubic' method does not use cubic spline
interpolation, but Moler's 'pchip' approach, a piecewise cubic Hermite
interpolation. Thus the results are
Dear all,
many thanks for your answer and support!!
Steve
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Hallo,
I'm facing a problem and I would really appreciate your support.
I have to translate some Matalb code in R that I don't know very well but I
would like to.
I have to interpolate 5 point with a cubic spline function and then I expect
my function returns the Y value as output a specific X
Hi Steve,
Check the splint function in the fields package.
HTH,
Jorge.-
On Sat, Dec 1, 2012 at 11:09 PM, Steve Stephenson wrote:
Hallo,
I'm facing a problem and I would really appreciate your support.
I have to translate some Matalb code in R that I don't know very well but I
would like
Hi Jorge,
many thanks for your suggestion!
I tried the function you mentioned and it looks working!!
Now I have just to check that splint (R) and interp1 (Matlab) functions
provide me the same results.
Kind regards!
Steve
--
View this message in context:
On Dec 1, 2012, at 5:09 AM, Steve Stephenson wrote:
Hallo,
I'm facing a problem and I would really appreciate your support.
I have to translate some Matalb code in R that I don't know very
well but I
would like to.
I have to interpolate 5 point with a cubic spline function and then
I
David Winsemius dwinsem...@comcast.net
on Sat, 1 Dec 2012 09:25:42 -0700 writes:
On Dec 1, 2012, at 5:09 AM, Steve Stephenson wrote:
Hallo, I'm facing a problem and I would really appreciate
your support. I have to translate some Matalb code in R
that I don't know very
Martin Maechler maechler at stat.math.ethz.ch writes:
[snip]
but definitely *no* need to use a function from an extra CRAN
package .. as someone else ``erronously'' suggested.
Note that
spline() and splinefun()
together with
approx() and approxfun()
are among the several hundred
How can I specify 'starting values' for a cubic spline ns()? I need
starting values for all pars when fitting using the nonlinear least
squares optimiser nls(). The y variable (length) is a function of 2
variables: alpha and age. The functional form for the age-length
relationship is specified as
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