Stavros Macrakis wrote:
On Mon, May 18, 2009 at 6:00 PM, Gabor Grothendieck ggrothendi...@gmail.com
wrote:
I understood what you were asking but R is an oo language so
that's the model to use to do this sort of thing.
I am not talking about creating a new class with an
Wacek Kusnierczyk wrote:
Stavros Macrakis wrote:
[...]
I am not talking about creating a new class with an analogue to the
subtraction function. I am talking about a function which applies another
function to a sequence and its lagged version.
Functional arguments are used all over
Wacek Kusnierczyk wrote:
btw., the error message here is confusing:
lag = 1:2
diff(1:10, lag=lag)
# Error in diff.default(1:10, lag = lag) :
# 'lag' and 'differences' must be integers = 1
is.integer(lag)
# TRUE
all(lag = 1)
# TRUE
what is meant is
Note that this could be done like this for ordinary
vectors:
x - seq(1:4)^2
apply(embed(x, 2), 1, function(x, f) f(rev(x)), f = diff)
[1] 3 5 7
apply(embed(x, 2), 1, function(x, f) f(rev(x)), f = sum)
[1] 5 13 25
or a method to rollapply in zoo could be added for ordinary vectors.
Here it
You can define a new class for the object diff operates
on and then define your own diff method for that. For
some examples see:
methods(diff)
On Mon, May 18, 2009 at 4:24 PM, Stavros Macrakis macra...@alum.mit.edu wrote:
I would like to apply a function 'f' to the lagged version of a vector
I guess I wasn't very clear. The goal is not to define diff on a different
object type, but to have a different 'subtraction' operator with the same
lag logic. An easy example would be quotient instead of subtraction. Of
course I could do that by simply cutting and pasting diff.default and
I understood what you were asking but R is an oo language so
that's the model to use to do this sort of thing.
On Mon, May 18, 2009 at 5:48 PM, Stavros Macrakis macra...@alum.mit.edu wrote:
I guess I wasn't very clear. The goal is not to define diff on a different
object type, but to have a
On Mon, May 18, 2009 at 6:00 PM, Gabor Grothendieck ggrothendi...@gmail.com
wrote:
I understood what you were asking but R is an oo language so
that's the model to use to do this sort of thing.
I am not talking about creating a new class with an analogue to the
subtraction function. I am
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