similar to: An R question

Displaying 20 results from an estimated 300 matches similar to: "An R question"

2017 Jun 07
0
An R question
Hi, Check the FAQ 7.31 https://cran.rstudio.com/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f And read the posting guide too... https://www.r-project.org/posting-guide.html HTH, Ivan -- Dr. Ivan Calandra TraCEr, Laboratory for Traceology and Controlled Experiments MONREPOS Archaeological Research Centre and Museum for Human Behavioural
2017 Nov 17
3
Dataframe is character
Hi everybody, Question: why are my dataframe and numeric variables a character? I read an excel file via readxl but my dataframe is a character, and numeric variables, eg "yi", are also a character. My excelfile is in English numeric Sometimes the dataframe was indeed a dataframe, but I do not know why it did sometimes. Thank you in advance, Roberto PS I used "guess". The
2017 Nov 17
0
Dataframe is character
class("dat") is different from class(dat), which is what you actually want. On 17-11-17, P. Roberto Bakker wrote: > Hi everybody, > > Question: why are my dataframe and numeric variables a character? > > I read an excel file via readxl but my dataframe is a character, and > numeric variables, eg "yi", are also a character. > My excelfile is in English
2017 Sep 19
1
Graph f(x) = 1/x
Dear Zeileis: Thank you very much abou On Tue, Sep 19, 2017 at 4:13 AM, Achim Zeileis <Achim.Zeileis at uibk.ac.at> wrote: > > > On Tue, 19 Sep 2017, AbouEl-Makarim Aboueissa wrote: > > Dear All: good morning >> >> I am trying to graph the function y=f(x)=1/x over the interval (-5,5). But >> I am getting an error message. Please see below. >>
2017 Nov 29
3
Removing a data subset
Say I have a dataset that looks like Location Year GW_Elv MW01 1999 546.63 MW02 1999 474.21 MW03 1999 471.94 MW04 1999 466.80 MW01 2000 545.90 MW02 2000 546.10 The whole dataset is at http://doylesdartden.com/ExampleData.csv and I use the code below to do the graph but I want to do it without
2016 Apr 26
1
ylim in barplot()
Thank you David, That's a nice workaround using plotrix::barp(), but that doesn't explain why ylim doesn't work as intended (or at least, as I expect it to work), or why xpd has no influence when using devEMF::emf()... The problem with saving directly in RStudio is that it requires to manually save the plot, and this becomes troublesome when there are a lot of plot commands in a
2007 Mar 20
1
Strange integer result on Debian/amd64
Using the following version of R: > R version 2.4.1 (2006-12-18) installed using apt-get on a Debian/Sarge AMD64 system with the following entry in /etc/apt/sources.lists: deb http://www.stats.bris.ac.uk/R/bin/linux/debian/ stable/ The problem: I'm seeing strange results in a integer calculation as follows: > choose(11,6) > [1] 462
2016 Apr 25
0
ylim in barplot()
If you are using a Windows system, you can Export the plot from RStudio and save it as a metafile without using package devEMF and it will crop the bars with xpd=FALSE. When I used devEMF on a Windows machine, the bars were not cropped with barplot() as you indicated, but when I switched to plotrix::barp() they were cropped. The arguments are a bit different, but I did not need xpd=FALSE:
2016 Apr 25
2
ylim in barplot()
Dear useRs, I'm having troubles with using ylim in barplot(): even though I reduce the y-scale using ylim, the bars still extend down to 0into the x-labels. The sample data is below, and here is the code. #This works fine but I would like to plot only from 50 to 70: barplot(t(mydata), beside=TRUE, col=c("orange", "green", "yellow", "purple"),
2010 Jul 29
1
precision of minus operation and if statments
Hi Everyone, as part of a larger script, I need to insert the result of a simple minus operation into an if statement. I have noticed that the precision that appear on the screen is not the precision in which R stores the result of the minus operation, and that this change alters the result of the if statement. For example, when running this simple script:   > a=0.90 > b=0.95 >
2010 Nov 28
5
unexpected behavior using round to 2 digits on randomly generated numbers
Hello! I stumbled upon something odd that took a while to track down, and I wanted to run it by here to see if I should submit a bug report. For randomly generated numbers (from a variety of distributions) rounding them to specifically 2 digits and then multiplying them by 100 produces strange results on about 8% of cases. The problematic numbers display as I would have expected, but do not
2008 Dec 09
3
== operand
Hi,   I am trying to compare two values using "==" operand, please take a look of the following example (I copied ALL what I did here without deleting any line)   >    bb<-1 > cc<-50 > cc==abs(bb+52) [1] FALSE > C<-53 > C<-53 > c<-53 > cc==abs(bb+52) [1] FALSE              I am expecting to see a TRUE here. Then I tried another way,   > abs(1+52)
2010 Nov 17
1
Give me all operator
Hello is there in R any operator that give you all the data of a matrix for example in matlab x(2,3) returns the 2ndth row and 3rdth column x(2,:) returns all the columns of the 2nd row. In R now I would like to print all the  CRagent[[i]][2]  CRagent[[:]][2] doesnot work of course. Other option is to make a loop with an index i that spans from 1:last element of CRagent[[]] but this is not
2003 Jul 10
6
info
HI I'm a student in chemical engineering, and i have to implement an algoritm about FIVE PARAMETERS INTERPOLATION for a calibration curve (dose, optical density) y = a + (c - a) /(1+ e[-b(x-m]) where x = ln(analyte dose + 1) y = the optical absorbance data a = the curves top asymptote b = the slope of the curve c = the curves bottom asymptote m = the curve X intercept Have you never
2011 Mar 04
4
Floating points and floor() ?
Perhaps somebody could clarify for me if the following is a floating point matter or otherwise, and how am I to correct for it? > floor(100*.1) [1] 10 > 100*(1.0-.9) [1] 10 > floor(100*(1-0.9)) [1] 9 Thanks! Michael _______________________________________________________ Michael Folkes Salmon Stock Assessment Canadian Dept. of Fisheries & Oceans Pacific Biological Station
2010 Feb 24
1
problem with looping on sqlSave()
Dear R users, I have a follow-up question on sqlSave(). Since most of the output from the tests I use are lists, I would like to loop to export each element of the list and append it to the sheet. Here is what I do: > library(RODBC) > test <- structure(list(m = structure(c(0.090909090909091, 0.181818181818182, 0.272727272727273, 0.363636363636364, 0.454545454545455,
2010 Jun 15
3
Problem about zero
Hello, everyone, There's a problem about zero in R and I really need your help. I have a vector shown as x=c(0.1819711,0.4811463,0.1935151,0.1433675), The sum of this vector is shown as 1 in R, but when I type 1-sum(x), the value is not zero, but -2.220446e-16. I can accept that this value is quite small and could be seen as zero, but there would be a problem when it's not really
2010 Dec 01
2
Problem in reading Excel spreadsheets
Hi folks, Win 7 64bit R 2.12.0 32bit Problem in reading Excel spreadsheets (the text file, research_databaseI.xls, was download on Internet) > data=odbcConnectExcel(file.choose()) > sqlTables(data) TABLE_CAT TABLE_SCHEM 1 C:\\Users\\satimiswin764\\Documents\\research_databaseI <NA> 2
2012 Feb 02
1
Writing out data
What is the best way to write out comma separated data, as a program is running (rather than waiting to the end using write.csv)? At the moment I'm doing this, but I guess it's not the most efficient. The data is in a column in the matrix postcount, and I'm using a loop to write out each of the 100 elements. for (j in 1:100) { cat(postcount[1,j], ",", file=filename,
2010 May 28
3
Using a loop to define new variables
Hi, I'm a novice R user, much more used to SAS. My problem is pretty simple - basically, in a data frame, I have variables named x1,....,x10 and y1,...,y10; and I would like to create r1 = x1 / y1 etc Apologies if this is way too rudimentary - but I couldn't find any posts online which solve this exact issue. Cheers, Andre