search for: 1e15

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2002 Jan 16
0
round() doesn't (PR#1139)
...fixed the fix; here's the relevant line from fround.c: if(dig <= 0 && fabs(res) < 1e9) res = (int)floor(res + 0.5); This solution casts the result as int if it's under a billion, but it re-introduces the original problem for large numbers: R-patched 01/13/2002> round(1e15, -2) - 1e15 [1] -0.25 So I'd ask to re-open PR#1139, and suggest another look at the "fround" C function that I posted (in a followup) on 10/24/2001 (copied below). I substituted it into src/nmath/fround.c, successfully re-built R, and it works. It handles th...
2010 Dec 07
3
More elegant magnitude method
...tion that works *so far*, but it is ugly and probably buggy. In the interest of avoiding code-based outliers in my data, I thought I would ask if anyone here has a better way. > scl <- function(x){ + length(charToRaw(format(trunc(x), scientific = F)))-1} > a <- 123456789 > b <- 1E15 > c <- 12.345 > scl(a) [1] 8 > scl(b) [1] 15 > scl(c) [1] 1 Thanks -------------------------------------- Jonathan P. Daily Technician - USGS Leetown Science Center 11649 Leetown Road Kearneysville WV, 25430 (304) 724-4480 "Is the room still a room when its empty? Does the roo...
2019 Jan 22
2
Objectsize function visiting every element for alt-rep strings
...LTREP it. > That's what happens for integers, but indeed fails to happen for > such as.character(.)ed integers. > > From my eRum presentation (which took from the official ALTREP documentation > https://svn.r-project.org/R/branches/ALTREP/ALTREP.html ) : > > > x <- 1:1e15 > > object.size(x) # 8000'000'000'000'048 bytes : 8000 TBytes -- ok, not really > 8000000000000048 bytes > > is.unsorted(x) # FALSE : i.e., R's *knows* it is sorted > [1] FALSE > > xs <- sort(x) # > > .Internal(inspect(x)) > @80255f8 1...
2004 Jan 05
2
Codec Negotiation Does not seem to work as expected ?? Help Please !!
...message. I do not know why asterisk behaves like this, and I do think if asterisk send the message back to ATA with g729 in its message it should have worked fith nating bridging. WARNING[1248642112]: File channel.c, Line 1853 (ast_channel_make_compatible): No path to translate from SIP/sip-a-1e15(256) to SIP/4097-96d8(4) Case 2 : ATA calling sip-b =================== ATA indicate that it can have following, codecs in SDP packet, in following order ATA --> asterisk INVITE message g729 ulaw alaw asterisk --> sip-b INVITE message (Note that unlike case 1, the decision by * i...
2019 Jan 21
0
Objectsize function visiting every element for alt-rep strings
...object *but* should not de-ALTREP it. That's what happens for integers, but indeed fails to happen for such as.character(.)ed integers. >From my eRum presentation (which took from the official ALTREP documentation https://svn.r-project.org/R/branches/ALTREP/ALTREP.html ) : > x <- 1:1e15 > object.size(x) # 8000'000'000'000'048 bytes : 8000 TBytes -- ok, not really 8000000000000048 bytes > is.unsorted(x) # FALSE : i.e., R's *knows* it is sorted [1] FALSE > xs <- sort(x) # > .Internal(inspect(x)) @80255f8 14 REALSXP g0c0 [NAM(7)] 1 :...
2019 Jan 23
1
Objectsize function visiting every element for alt-rep strings
...deed fails to happen for >>> such as.character(.)ed integers. >>> >>> From my eRum presentation (which took from the official ALTREP >> documentation >>> https://svn.r-project.org/R/branches/ALTREP/ALTREP.html ) : >>> >>> > x <- 1:1e15 >>> > object.size(x) # 8000'000'000'000'048 bytes : 8000 TBytes -- ok, not >> really >>> 8000000000000048 bytes >>> > is.unsorted(x) # FALSE : i.e., R's *knows* it is sorted >>> [1] FALSE >>> > xs <- sort(x...
2019 Jan 15
4
Objectsize function visiting every element for alt-rep strings
I have a toy alt-rep string package that generates randomly seeded strings. example: library(altstringisode) x <- altrandomStrings(1e8) head(x) [1] "2PN0bdwPY7CA8M06zVKEkhHgZVgtV1" "5PN2qmWqBlQ9wQj99nsQzldVI5ZuGX" ... etc object.size(1e8) Object.size will call the set_altstring_Elt_method for every single element, materializing (slowly) every element of the vector. This
2003 Feb 14
0
FW: [Fwd: Re: [S] Exact p-values]
...ect answer, you need to understand the following: > > > pbinom(1, 2, .5) > [1] 0.75 > > This is the binomial cumulative distribution function. > *** pbinom(0, 2, .5) = 0.25 > *** pbinom(1, 2, .5) = 0.75 = 0.25 + 0.5 > *** pbinom(2, 2, .5) = 1 > > However, pbinom(1e15, 2e15, .5) is a computational challenge. Standard > numerical algorithms often fail in situations like this. The code > should test for such cases and use more numerically stable > "approximations" in place of the "exact" algorithms. > > The standard deviati...
2019 Jan 22
0
Objectsize function visiting every element for alt-rep strings
...ens for integers, but indeed fails to happen for > > such as.character(.)ed integers. > > > > From my eRum presentation (which took from the official ALTREP > documentation > > https://svn.r-project.org/R/branches/ALTREP/ALTREP.html ) : > > > > > x <- 1:1e15 > > > object.size(x) # 8000'000'000'000'048 bytes : 8000 TBytes -- ok, not > really > > 8000000000000048 bytes > > > is.unsorted(x) # FALSE : i.e., R's *knows* it is sorted > > [1] FALSE > > > xs <- sort(x) # > > > .In...
2004 Jan 05
0
Codec Negotiation Does not seem to work as e xpected ?? Help Please !!
...terisk behaves like this, and I do think if asterisk send the > message back to ATA with g729 in its message it should have worked fith > nating bridging. > > WARNING[1248642112]: File channel.c, Line 1853 > (ast_channel_make_compatible): No path to translate from > SIP/sip-a-1e15(256) to SIP/4097-96d8(4) > > > > Case 2 : ATA calling sip-b > =================== > > ATA indicate that it can have following, codecs in SDP packet, in following > order > ATA --> asterisk INVITE message > g729 > ulaw > alaw > asterisk --> si...
2003 Feb 14
1
FW: [Fwd: Re: [S] Exact p-values]
Dear all Just for fun, I have just downloaded the paper mentioned below and checked it with R-1.6.1. Everything is ok with exception of Table 2b, where I get always 1 instead of 0.5: > pbinom(1e15,2e15,0.5) [1] 1 Which value should be correct? Best regards Christian Stratowa ============================================== Christian Stratowa, PhD Boehringer Ingelheim Austria Dept NCE Lead Discovery - Bioinformatics Dr. Boehringergasse 5-11 A-1121 Vienna, Austria Tel.: ++43-1-80105-2470 Fax:...