The : operator does give a numeric, non-integer result
when integer would not be sufficient:
1.1:10.1
On Jan 30, 2008 9:28 AM, [EMAIL PROTECTED] wrote:
Ok, I get your point.
On the other hand, R is not only for high level programmer. On low
level, the fact that : change the type is
On Jan 29, 2008 10:40 PM, Christophe Genolini [EMAIL PROTECTED] wrote:
x[c(2,4)] work as well
My point is that that at the native-code level subsetting/enumeration
is done by integer indices and coercion from double to integer is
always going to less efficient than working directly with
Seems strange to me to define an operator relatively to a very special case.
I have to admit that I do not use 1:1e7 every day :-)
Wouldn't it be more appropriate to define a a:b operator numeric (that
is preserving the initial class of a and b) and in specific case that
need optimization,
x[1:n]
/H
On Jan 29, 2008 5:07 AM, [EMAIL PROTECTED] wrote:
Seems strange to me to define an operator relatively to a very special case.
I have to admit that I do not use 1:1e7 every day :-)
Wouldn't it be more appropriate to define a a:b operator numeric (that
is preserving the initial
x[c(2,4)] work as well
Henrik Bengtsson a écrit :
x[1:n]
/H
On Jan 29, 2008 5:07 AM, [EMAIL PROTECTED] wrote:
Seems strange to me to define an operator relatively to a very special case.
I have to admit that I do not use 1:1e7 every day :-)
Wouldn't it be more appropriate to define
Christophe Genolini wrote:
Hi the list.
I do not understand the philosophy behind numeric and integer.
- 1 is numeric (which I find surprising)
- 2 is numeric.
- 1:2 is integer.
Why is that ?
I hope I can answer your question at least partly:
Numeric means double, i.e. internally
On 28-Jan-08 21:23:12, Roland Rau wrote:
Christophe Genolini wrote:
Hi the list.
I do not understand the philosophy behind numeric and integer.
- 1 is numeric (which I find surprising)
- 2 is numeric.
- 1:2 is integer.
Why is that ?
I hope I can answer your question at least partly:
On 28-Jan-08 22:40:02, Peter Dalgaard wrote:
[...]
AFAIR, space is/was more of an issue. If you do something like
for i in 1:1e7
some.silly.simulation()
then you have 40 MB sitting there doing nothing, and 80 MB if
it had been floating point.
Hmmm ... there's something to be said
(Ted Harding) wrote:
Further to the above: The help
?:
says:
Value:
For numeric arguments [as opposed to factors],
a numeric vector. This will be of type 'integer'
if 'from' and 'to' are both integers and
representable in the integer type, otherwise of
type 'numeric'.
By
Further to the above: The help
?:
says:
Value:
For numeric arguments [as opposed to factors],
a numeric vector. This will be of type 'integer'
if 'from' and 'to' are both integers and
representable in the integer type, otherwise of
type 'numeric'
???
This is very
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