search for: dallazuanna

Displaying 20 results from an estimated 177 matches for "dallazuanna".

2007 Oct 22
median value dataframe coming from multiple dataframes
Hi all, I am not a skillful R programmer and has I am handling with large dataframes (about 30000 x 300) I am in need of an efficient function. I have 4 dataframes with the same dimension. I need to generate other dataframe with the some dimension than the others where in each position it has the median value of the 4 values in the same position coming from the 4 dataframes. Grateful by your
2010 Aug 05
Extracting future and past workday dates
Hello everyone I need to extract a vector of (t-3) to (t+3) dates, only working days. How can I do that? For today I need a vector: 10.08.210 09.08.2010 06.08.2010 05.08.2010 04.08.2010 03.08.2010 02.08.2010 Regards, Sergey -- Kniven sk?rpes bara mot stenen.
2009 Jul 08
RDCOMClient: how to close Excel process?
Hi, I?m using R package RDCOMClient ( to retrieve data from MS Excel workbook. I?m using the code below to count the number of sheets in the workbook and then loop the data from sheets in to a list. ############# R code ################### library(gdata) library(RDCOMClient) xl <- COMCreate("Excel.Application") sh <-
2011 Apr 07
Regrouping data
Dear R forum I have just started my venture with R. While I am trying to learn R through the tutorials, I think the current problem I need to address to is beyond my knowledge about R. I have a dataframe as defined below - rat_dat = data.frame(name = c("A", "A", "A", "B", "B", "B", "C", "C", "C",
2010 Aug 03
concatenate values in the vector
Hi all, Is there a function that allow me to concatenate each value in a vector to a string? x<-c("a","b","c","d") output string = a+b+c+d Thanks, phoebe [[alternative HTML version deleted]]
2010 Sep 27
scientific vs. fixed notation in xyplot()
Hi I am using xyplot() to plot on the log scale by using scale=list(log=T) argument. For example: xyplot(1:10~1:10, scales=list(log=T)) But the axis labels are printed as scientific notation (10^0.0, etc), instead of fixed notation. How can I change that to fixed notation? options(scipen=4) doesn't work on xyplot() Thanks John
2008 Oct 18
Select only cases with negative values
Hello, I was wondering if there was a way to only select cases my from data frame that contained a negative value? > c<-c(1,2,3,4,5,6,7,8,9,10) > d<- c(-1,2,-3,-4,5,6,-7,8,-9,10) > f <- cbind(c,d) > dat <-data.frame(f) > dat.lm <-lm(c~d) If I wanted to only use the rows that had a negative value in column d for my regression, how could I make that selection?
2010 Mar 22
Factors attribute?
I noticed that when I fit a linear model using 'lm' there is an attribute called "factors" that is added to the "term". It doesn't seem to appear for 'model.matrix', just 'lm'. I have been unable to find where it gets constructed or what it means? It looks like a two dimensional array that I may be able to use so I would just like to get some
2010 Feb 26
counting the number of ones in a vector
Dear R users, I want to count the number of ones in a vector x. That's what I did : length( x[x==1] ) Is that a good solution ? Thank you very much, Randall [[alternative HTML version deleted]]
2009 Jan 06
Using apply for two datasets
I can run one-sample t-test on an array, for example a matrix myData1, with the following apply(myData1, 2, t.test) Is there a similar fashion using apply() or something else to run 2-sample t-test with datasets from two groups, myData1 and myData2, without looping? TIA, Gang
2010 Nov 17
reduce print accuracy
Hello everyone. Consider the following number below:  0.9333333333333333 0.9333333333333333 0.0666666666667 Is it possible to print them with less digits like 0.93 0.93 0.06 (but without losing the R's accuracy). I would like to thank you in advance Best Regards Alex [[alternative HTML version deleted]]
2007 Oct 27
How to generate all permutation of 0-1 sequences in R?
Hi, folks: I need to generate all 0-1 sequences with given length,say,n=3, the ideal result would be the following matrix: 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 Any help would be appreciated. -- View this message in context: Sent from the R help mailing list archive at
2010 Sep 12
using read.table, removing extra quotation mark from a text field? (e.g. ""cat" )
I am using read.table to import a text file within R.   There are several "errors" in my text file.  An "extra" quotation mark has inadvertently been included within a few text fields.   e.g. for a pipe (|) delimited text file, I have something similar to this:   1|7|30| "dog" 2|6|25| ""cat" 3|4|20|"" 4|5| 56| "mouse" 5|3|56|
2009 Aug 10
strsplit a matrix
Dear all, I am trying to split a matrix into 2 as efficiently as possible. It is a character matrix: 1 2 3 1 "2-271" "2-367" "1-79" 2 "2-282" "2-378" "1-90" 3 "2-281" "2-377" "1-89" I want to make 2 matrices from this, as succinctly and efficiently as possible. I've tried such
2008 Apr 16
What objects will save.image saves ? And how to specify objects to be saved..
Hi, I have a R script that loads an image, does some operations, then save to the again. Suppose I have done some computation before loading the R script, will all the objects before the R script execution be saved to ? If yes, how can I specify save.image to save only those objects created in the R script ? Thanks Stanley [[alternative HTML version deleted]]
2011 Mar 28
Ordering data.frame based on class
Dear R helpers Suppose I have a data.frame as given below - my_dat = data.frame(class = c("XYZ", "XYZ", "XYZ", "XYZ", "XYZ","ABC", "ABC", "ABC", "ABC", "ABC" ),  var1 = c(20, 14, 89, 81, 17, 44, 36, 41, 11, 36), var2 = c(1001, 250, 456, 740, 380, 641, 111, 209, 830, 920)) > my_dat    class
2008 Sep 27
quantile / centile
I'm wondering if there is a simple way to assign a quantile to a vector in a data frame, much like one could in Stata using centile. Let's say I want 100 slices in my assignation. I can easily see what the limits of each slice by using quantile: quantile(my.df$my.var, probs=seq(0, 1, 0.01)) But how do I assign the appropriate value to each row/record in my data frame? Clearly the
2009 Jul 07
error: no such index at level 2
Hi, I am confused about how to select elements from a list. I'm trying to select all rows of a table 'crossRsorted' such that the mean of a related vector is > 0. The related vector is accessible as a list element l[[i]] where i is the row index. I thought this would work: > crossRsorted[mean(q[[ crossRsorted[,1] ]], na.rm = TRUE) > 0, ] Error in q[[crossRsorted[, 1]]] :
2007 Oct 30
strwidth of bold font
Hi! Is there a way to get the string width of the bold typefaces? like: strwidth("text", family = "serif", font = 2). Thanks Roland
2010 Jan 11
R for windows 64 bit
Dear all, do you know if there is any particular version of R to implement with windows 64 bit, in such a way to increase the amount of memory it can use? How should I increase the memory, and more importantly to set a higher max vector size? It still stops me saying "Could not allocate vector of size 145" thanks to all alessia