On 26-Aug-08 10:30:30, David Epstein wrote:
> Code:
>> options("contrasts")
> $contrasts
> factor ordered
> "contr.treatment" "contr.poly"
>
> I want to change the first entry ONLY, without retyping "contr.poly".
> How do I do it? I have tried various possibilities and cannot get
> anything to work.
> I found out that the response to options("contrasts") has class "list",
> but that doesn't help me, although I think it ought to help.
>
> Second question (metaquestion). How should I go about finding out the
> answer to a question like "How does one change a single item in a
> list?"
In view of your meta-meta-strategy, here is a response to the
meta-question:
If you sijmply want to replace a given component (say $C) of
a list L, then use code like:
L$C <- your.replacement
If you want to change the contents of a component of a list,
then what you need to do will depend on the nature of that
component (number, vector, array, anova table, list ... ).
Simple example:
L<-list(A="A",B="B",C="Z",D="D")
L
# $A
# [1] "A"
# $B
# [1] "B"
# $C
# [1] "Z"
# $D
# [1] "D"
C<-L$C ## extract $C from L
C
# [1] "Z"
C<-"C" ## change it
L$C<-C ## put it back
L
# $A
# [1] "A"
# $B
# [1] "B"
# $C
# [1] "C"
# $D
# [1] "D"
> My answer to the meta-meta-question is to post to this list.
> I hope that at least that part is correct.
It has been known to work ...
Ted.
--------------------------------------------------------------------
E-Mail: (Ted Harding) <[EMAIL PROTECTED]>
Fax-to-email: +44 (0)870 094 0861
Date: 26-Aug-08 Time: 14:42:29
------------------------------ XFMail ------------------------------
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
