On Feb 17, 2010, at 1:48 PM, Gabor Grothendieck wrote:
Try this:
do.call(curve, list(D(expression(x^3), "x")))
This also worked, after noting that str() told me the D() object had a
"language" attribute, but given that it was not the chosen method by
Gabor, it may have some deficiency about which I am unaware:
curve( eval(D(expression(x^3), "x") ) )
His do.call method does result in a more intuitive labeling of the y-
axis.
--
David.
On Wed, Feb 17, 2010 at 1:31 PM, Walmes Marques Zeviani
<walmeszevi...@hotmail.com> wrote:
Hi all,
I want to provide the result from D() to curve(), because I want to
plot the k-th derivative of some functions. Actually, I copy from
console the result given by D() and paste inside curve(). With a
lot of functions and high degree differentiation this process is
tedious. Can I provide directly??
# what I actually have done (very simple function)
D(expression(x^3), "x") # copy this result
curve(3 * x^2) # paste inside
# my failed attempts
curve(as.expression(D(expression(x^3), "x")))
curve(as.character(as.expression(D(expression(x^3), "x"))))
curve(noquote(as.character(as.expression(D(expression(x^3), "x")))))
Thanks in advance.
Walmes Zeviani, Brasil.
________________________________________________________________
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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