On 2010-06-21 3:30, Thaler, Thorn, LAUSANNE, Applied Mathematics wrote:
Hi everybody,
I'd like to have a list with two elements, where both elements have the same
value:
z<- list(a=1, b=1)
If it happens, that I've to change the value, I've to assure that I change
both. This is error prone. Hence, a better way to achieve this is to define:
tmp<- 1
z<- list(a=tmp, b=tmp)
Now, I'm wondering if it is possible to make this more compact:
z<- list(a=tmp<-1, b=tmp)
Both approaches have the side effect that a variable "tmp" is created. So is
there a way to achieve the same thing without having to define an additional variable?
Something like
z<- list(a=1, b=a)
or even
z<- list(a=b=1)?
Both commands don't work of course, but I'm just curious whether this is
possible in principle (a rather academic question I've to admit)
f <- function(x){ list(a=x, b=x) }
z <- f(1)
etc.
-Peter Ehlers
Thanks + BR,
Thorn Thaler
Applied Mathematics Group
Nestlé Research Center
PO Box 44
CH-1000 Lausanne 26, Switzerland
Phone: + 41 21 785 8220
Fax: + 41 21 785 8556
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