On 12-01-07 2:44 PM, cbe...@tajo.ucsd.edu wrote:
Duncan Murdochmurdoch.dun...@gmail.com writes:
On 12-01-06 10:21 PM, Rolf Turner wrote:
On 07/01/12 15:51, R. Michael Weylandtmichael.weyla...@gmail.com wrote:
I imagine the answer will involve lazy evaluation and require you use force()
On Sun, Jan 8, 2012 at 7:50 AM, Duncan Murdoch murdoch.dun...@gmail.com wrote:
On 12-01-07 2:44 PM, cbe...@tajo.ucsd.edu wrote:
Duncan Murdochmurdoch.dun...@gmail.com writes:
On 12-01-06 10:21 PM, Rolf Turner wrote:
On 07/01/12 15:51, R. Michael Weylandtmichael.weyla...@gmail.com
wrote:
The following gives a list, 'z', of functions with
different values of the variable 'i':
z - lapply(1:3, function(i) { force(i) ; function() cat(i is, i, \n)})
z[[3]]()
i is 3
z[[2]]()
i is 2
Their printed values don't show the difference,
as they depend on the 'i' stored in their
On 12-01-06 10:21 PM, Rolf Turner wrote:
On 07/01/12 15:51, R. Michael Weylandtmichael.weyla...@gmail.com wrote:
I imagine the answer will involve lazy evaluation and require you use force()
but I'm not quite qualified to pronounce and not at a computer to test.
I think you've got it; I
On Sat, Jan 7, 2012 at 10:23 AM, Duncan Murdoch
murdoch.dun...@gmail.com wrote:
On 12-01-06 10:21 PM, Rolf Turner wrote:
On 07/01/12 15:51, R. Michael Weylandtmichael.weyla...@gmail.com wrote:
I imagine the answer will involve lazy evaluation and require you use
force() but I'm not quite
Here is yet another way of doing it using 'local':
junk- vector(list,4)
for(i in 1:4) {
+ junk[[i]] - local({
+ local_i - i
+ function(x) 42 + local_i * x
+ })
+ }
for (i in 1:4) cat(i, junk[[i]](1), '\n')
1 43
2 44
3 45
4 46
On Sat, Jan 7, 2012 at 10:38 AM, Gabor
Now that we've all satisfied our curiosity :-) about force() in for and
while loops, I suppose it would be impolite to ask Rolf whether there
isn't a much neater and simpler way to make his internal functions grab
whatever the index 'i' is pointing them to?
--
Sent from my Cray XK6
Duncan Murdoch murdoch.dun...@gmail.com writes:
On 12-01-06 10:21 PM, Rolf Turner wrote:
On 07/01/12 15:51, R. Michael Weylandtmichael.weyla...@gmail.com wrote:
I imagine the answer will involve lazy evaluation and require you use
force() but I'm not quite qualified to pronounce and not at
On 08/01/12 05:24, Carl Witthoft wrote:
Now that we've all satisfied our curiosity :-) about force() in for
and while loops, I suppose it would be impolite to ask Rolf whether
there isn't a much neater and simpler way to make his internal
functions grab whatever the index 'i' is pointing
On 08/01/12 04:38, Gabor Grothendieck wrote:
SNIP
These two variations without bquote and the third which just replaces
for with while all (that I had previously posted) do work:
# 1
junk- vector(list,4)
for(i in 1:4) {
junk[[i]]- eval(substitute(function(x) { 42 + i * x }, list(i =
On Jan 7, 2012, at 23:29 , Rolf Turner wrote:
The fact that I don't really understand any of this stuff and am basically
groping around in the dark, hammering and hoping, doesn't make it
any easier! :-)
As if it weren't confusing enough when working as intended, there appears to
have been
I want to create a list of functions in a for loop, with the index
of the loop appearing explicitly in the function code.
After quite a bit of thrashing around I figured out how to do it.
Here is a toy example:
junk - vector(list,4)
for(i in 1:4) {
itmp - i
junk[[i]] -
I imagine the answer will involve lazy evaluation and require you use force()
but I'm not quite qualified to pronounce and not at a computer to test.
Michael
On Jan 6, 2012, at 8:43 PM, Rolf Turner rolf.tur...@xtra.co.nz wrote:
I want to create a list of functions in a for loop, with the
On Jan 6, 2012, at 9:51 PM, R. Michael Weylandt michael.weyla...@gmail.com
wrote:
I imagine the answer will involve lazy evaluation and require you
use force() but I'm not quite qualified to pronounce and not at a
computer to test.
Your theory passes the experimental test:
for(i in
On 07/01/12 15:51, R. Michael Weylandt michael.weyla...@gmail.com wrote:
I imagine the answer will involve lazy evaluation and require you use force()
but I'm not quite qualified to pronounce and not at a computer to test.
I think you've got it; I tried
junk - vector(list,4)
for(i in 1:4) {
On Fri, Jan 6, 2012 at 9:43 PM, Rolf Turner rolf.tur...@xtra.co.nz wrote:
I want to create a list of functions in a for loop, with the index
of the loop appearing explicitly in the function code.
After quite a bit of thrashing around I figured out how to do it.
Here is a toy example:
junk
Presumably because the i = 4 has to be re-evaluated at the start of
each iteration of the while-loop which implicitly force()s it?
Though, I don't know if it might not be a bad idea to put an implicit
force() in the internal code for `for` to prevent these sorts of
things. I can't immediately
On Fri, Jan 6, 2012 at 11:13 PM, R. Michael Weylandt
michael.weyla...@gmail.com wrote:
Presumably because the i = 4 has to be re-evaluated at the start of
each iteration of the while-loop which implicitly force()s it?
Though, I don't know if it might not be a bad idea to put an implicit
18 matches
Mail list logo
