On Fri, Sep 13, 2024 at 1:10 PM Duncan Murdoch wrote:
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> On 2024-09-13 8:53 a.m., Jonathan Dushoff wrote
> Message: 4
> Date: Thu, 12 Sep 2024 11:21:02 -0400
> From: Duncan Murdoch
> That's not the correct formula, is it? I think the result should be x *
> Conj(y) / Mod(y)^2 .
Correct, sorry. And thanks.
> So that would involve * and
> / , not just real arithmetic.
Not an expert, but I don't s
> In this case, I do think we should look into the consequences of
> indeed distinguishing
>*
>* and
>/
> from their respective current {1. coerce to complex, 2. use complex arith}
> arithmetic.
I'm wondering whether – if this indeed gets opened up – it might also
make sense to cal
Thanks for your help, and sorry for mis-posting.
JD
On Wed, Sep 25, 2013 at 3:18 AM, Matthew Dowle wrote:
> Very sorry to hear this bit you. If you need a copy of names before
> changing them by reference :
> oldnames <- copy(names(DT))
> This will be documented and it's on the bug list
I got bitten badly when a variable I created for the purpose of
recording an old set of names changed when I didn't think I was going
near it.
I'm not sure if this is a desired behaviour, or documented, or warned
about. I read the data.table intro and the FAQ, and also ?setnames.
Ben Bolker crea
all.equal(m,mm,check.attributes=FALSE)
> gives TRUE!!! I.e. sometimes attributes really are vital characteristics.
> cheers,
> Rolf Turner
> On 16/11/12 08:52, Jonathan Dushoff wrote:
>> I have two matrices, generated by R functions that I don't understa
I have two matrices, generated by R functions that I don't understand.
I want to confirm that they're the same, but I know that they have
different attributes.
If I want to compare the dimnames, I can say
> identical(attr(tm, "dimnames"), attr(tmm, "dimnames"))
[1] FALSE
or even:
> identical(d
David:
Thank you for your very valuable response. In fact, I was trying to
_avoid_ partial matching, not accomplish it. Subset is a _much_ better
way of doing what I was trying to do.
Humorously, however, your code also reproduces the mistake that brought
me here, AFAICT. I think my code
I have a list of observations of individuals. I would like to make a
list of individuals, with a data frame of observations for each individual.
The following code usually works, but not always
--
# Make a list of empty data
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