Marc,
Thanks very much for this. I hadn't really looked at Rprof in the
past; now I have a new toy to play with!
I have formulated an hypothesis that the reason parse/eval is quicker
lies in the pattern-matching code: strsplit is using regular
expressions, whereas perhaps parse is using some
On Sat, 2006-08-19 at 10:25 -0600, Mike Nielsen wrote:
Wow. New respect for parse/eval.
Do you think this is a special case of a more general principle? I
suppose the cost is memory, but from time to time a speedup like this
would be very beneficial.
Any hints about how R programmers
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
[1] 3,6,10
into c(3,6,10) for subsequent use.
as.numeric(repeated.measures.columns) doesn't work (likely because of the
commas)
[1] NA
Warning message:
NAs introduced by coercion
On Sat, 19 Aug 2006, Charles Annis, P.E. wrote:
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
[1] 3,6,10
into c(3,6,10) for subsequent use.
as.numeric(repeated.measures.columns) doesn't work (likely because of the
On Sat, 19 Aug 2006, Marc Schwartz wrote:
On Sat, 2006-08-19 at 07:58 -0400, Charles Annis, P.E. wrote:
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
[1] 3,6,10
into c(3,6,10) for subsequent use.
On Sat, 2006-08-19 at 13:30 +0100, Prof Brian Ripley wrote:
On Sat, 19 Aug 2006, Marc Schwartz wrote:
On Sat, 2006-08-19 at 07:58 -0400, Charles Annis, P.E. wrote:
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
, August 19, 2006 7:59 AM
To: r-help@stat.math.ethz.ch
Subject: [R] string-to-number
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
[1] 3,6,10
into c(3,6,10) for subsequent use.
as.numeric(repeated.measures.columns) doesn't work (likely
.
Sent: Saturday, August 19, 2006 7:59 AM
To: r-help@stat.math.ethz.ch
Subject: [R] string-to-number
Greetings, Amigos:
I have been trying without success to convert a character string,
repeated.measures.columns
[1] 3,6,10
into c(3,6,10) for subsequent use.
as.numeric
Wow. New respect for parse/eval.
Do you think this is a special case of a more general principle? I
suppose the cost is memory, but from time to time a speedup like this
would be very beneficial.
Any hints about how R programmers could recognize such cases would, I
am sure, be of value to the
