similar to: unexpected behavior using round to 2 digits on randomly generated numbers

> length(sample(25000, 25000*(1-.55))) [1] 11249 > 25000*(1-.55) [1] 11250 > length(sample(25000, 11250)) [1] 11250 > length(sample(25000, 25000*.45)) [1] 11250 So the question is, why do I get 11249 out of the first command and not 11250? I can't figure this one out. Thanks Cory [[alternative HTML version deleted]]

Full_Name: Raimon Massanet Version: 2.9.2 OS: Linux Ubuntu 8.10 Submission from: (NULL) (147.83.71.76) # Hi there. # I'm not sure whether or not this is a bug. # But it surely is an unexpected behaviour. V <- seq(from=0,to=1,by=0.1) # Should generate a sequence with a step of 0.1 V==0 # [1] TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE # Ok! V==0.1 # [1] FALSE

Hello everyone, I use latex() (Hmisc) for report generation and thus have been affected by the problem with rounding decimals described, for example, in this post: http://thread.gmane.org/gmane.comp.lang.r.general/73287/focus=73287 In short, numbers often are printed with 15 or so decimals even if there far less significant digits. The problem has been confirmed by Frank Harrell and Thomas

Hello:I am trying to match the value 0.3 in the sequence seq(.2,.3). I get > 0.3 %in% seq(from=.2,to=.3) [1] FALSE Yet > 0.3 %in% c(.2,.3) [1] TRUE For arbitrary sequences, this "invisible .3" has been problematic. What is the best way to work around this? Thank you. Dan [[alternative HTML version deleted]]

Dear R-users with a bit of grief I had to repeat an extensive analysis because I did not suspect (and therefore did not read the documentation) that round was implemented as "for rounding off a 5, the IEC 60559 standard is expected to be used, 'go to the even digit'", resulting in round(1.5) = 2 round (2.5) = 2. As a non-mathematician I am both puzzled and intrigued by

Hi, Can someone explain this: > options(digits=20) > 1/3 [1] 0.33333333333333331483 Why the 1483 at the end? Thanks, David. david-arnolds-macbook-pro-2:~ darnold$ R --version R version 2.15.2 (2012-10-26) -- "Trick or Treat" Copyright (C) 2012 The R Foundation for Statistical Computing ISBN 3-900051-07-0 Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) -- View this

Hi! I'm running R version 2.13.0 (2011-04-13) Platform: i386-pc-mingw32/i386 (32-bit) When i type in the command: sum(c(-0.2, 0.8, 0.8, -3.2, 1.8)) R returns the value: -5.551115e-17 Why doesn't R return zero in this case? There shouldn't be any rounding error in a simple sum. Thanks, Mark

Dear all, I have been running some tests of my package RSiena on different platforms and trying to reconcile the results. With Mac, the commands options(digits=4) round(1.81652, digits=4) print 1.817 With Windows, the same commands print 1.816 I am not bothered which answer I get, but it would be nice if they were the same. A linux box agreed with the Mac. Mac sessionInfo(): R version

My box plot below is drawing its upper whisker all the way to the last point, instead of showing the point as an outlier. Am I misunderstanding, or is it a bug? Help(boxplot) states for the parameter ?range? that ?this determines how far the plot whiskers extend out from the box. If range is positive, the whiskers extend to the most extreme data point which is no more than range times the

Full_Name: Gostan Thierry Version: 2.6.1 (2007-11-26) OS: Windows XP Submission from: (NULL) (193.49.190.42) I cannot explain why R seems to have problems adding two big numbers. sprintf("%f",10^4+10^19) gives "10000000000000010240.000000" instead of "10000000000000010000.000000" problems seems to arrive when i'm trying to add a big and a

I am trying to use round()to force R to display a specific number of decimals, but it seems to display <=2 decimals no matter what I specify in the digits argument. As an alternative I tried signif(), but it also produces unexpected results. See example code and results below. Format() works, but then the result no longer is numeric. Am I missing something simple? I am using R 2.9.0 on Windows

Hello, When I am writing in sqldf or RSQLite I lose the decimals in my matrix. The only way I can get decimals is by multiplying by 1.00000, etc. I have tried manipulating the options, but it is only effective once I multiply by 1.0000. I appreciate any suggestions! Thanks! Example: z <- sqldf ("select ST, SUM(AGEP*PWGTP)*1.000000000/SUM(PWGTP)*1.00000000000000 as wgtage from ss09

Hi there I am going to calculate VAT at one of my websites, and UK VAT is 17.5 %. So the question is how to round up some value to two decimal points? I often get values like 6,991.. In php I was using round function round($price, 2) is in ruby something similat to PHP''s round function where I could specify number of decimal places ? P.

DEar list members, I am currently using Sweave with LaTeX which is great. I can use xtable for formatting outp of tables but I have a problem setting the number of decimals in xtables when used with dataframe. I have found an example on the net ith matrix and it works. For example this works : > > tmp <- matrix(rnorm(9), 3, 3) > > xtmp <- xtable(tmp) > > digits(xtmp)

Hello, I'm producing a 3D plot using the persp function. All my values for X, Y, and Z are decimals ranging from 0 to 1. I'd like to be able format the three axes so that the tick values are 0% 20% 40%, etc... instead of just being 0 .2 .4. Does anyone know how to do this?   Many thanks,   Steve [[alternative HTML version deleted]]

Is this a bug somewhere? The format function, using a specific number of digits, doesn't give sensible results: R> set.seed(2);print(x<-rexp(5)) [1] 1.86535 0.40475 0.14665 1.73071 0.08953 R> format(x,digits=1) [1] "1.87" "0.40" "0.15" "1.73" "0.09" R> format(x,digits=2) [1] "1.87" "0.40" "0.15"

I have some questions regarding Zero Inflation Poisson models. I am using count data to analyze abundance trends of salamanders. However, I have surveys which differ in the amount of effort (i.e. the number of people searching and amount of time - I am using a museum database so not all surveys were conducted by me). Therefore I need to account for the effort. If change the count (response

I think there is a discrepancy In the help for object.size(). In the usage section there is the comment: ## S3 method for class 'object_size': while in the value section there is the text: An object of class ?"object.size"? ... And R itself says: > class(object.size(letters)) [1] "object_size" Also, I was trying to print out object sizes in Kb, but rounded to

Hello, I've encountered a very weird issue with the method subset(), or maybe this is something I don't know about said method that when you're subsetting based on the columns of a data frame you can only use constants (0.1, 2.3, 2.2) instead of variables? Here's a look at my data frame called 'ea.cad.pwr': *>ea.ca.pwr[1:5,] MAF OR POWER 1 0.02 0.01 0.9999 2 0.02

Hi there, This is summary and patch for a bug in read.dbf, demonstrating in Message-Id: <20050818150446.697835cb.stanimura-ngs at umin.ac.jp>. After consulting Rjpwiki, a cyber-community of R user in Japan, the cause was found, and the patch of solution was proposed. Overflowing occurs when we use read.dbf for reading a dbf file having a field of longer signed integer. For example, $