search for: lifeofknudsen

Dear R community! I am trying to create a heatmap based on the following data. As you can see the diagonal (0,0 to 10,10) is always 0). If I run the heatmap command like i posted it I get a graph with horizontal lines. What is my mistake? > heatmap(activity.matrix, Rowv = NA, Colv = NA, scale="column", xlab="x Compounds", ylab="y Compounds",

...on of more than one number? I could do c(which(x==2),which(x==3)) but isn't there something more streamlined? My first guess was y=c(2,3) which(x==y) integer(0) which doesn't work. I haven't found any clue in the R manual. Thanks! -- Michael Knudsen micknudsen at gmail.com http://lifeofknudsen.blogspot.com/

...11:10. Usually programming laguages would regard what corresponds to 11:10 as empty, but A:B with A bigger than B is in R interpreted as the numbers from B to A in reverse order. Is there a clever way to make nested loops like the one above in R? -- Michael Knudsen micknudsen at gmail.com http://lifeofknudsen.blogspot.com/

I am stumped. I have a data set with multiple columns and about 65,000 case. Some of the cases have a "#NULL!" value so for dataframe "Props_": access_emp pct_vacant TAVAIL park PARKACRES totlandare 4538 52.15 #NULL! 0 1 22.99 74,129.70400 4539 52.15 .09 0 1 22.99 982,850.80400 10292 54.20

...n to come up with a substitute for c in the .combine option. I have checked out the big.matrix manual, but I can't find a function suitable for just that. Actually, I wouldn't even know how to do it for a usual matrix. Any clues? Thanks! -- Michael Knudsen micknudsen at gmail.com http://lifeofknudsen.blogspot.com/

Hi, Our discussions about 64 bit R has led me to another thought. I have a nice dual core 3.0 chip inside my Linux Box (Running Fedora 11.) Is there a version of R that would take advantage of BOTH cores?? (Watching my system performance meter now is interesting, Running R will hold a single core at 100% perfectly, but the other core sites idle.) Thanks! -- Noah

Hi, excuse me for my english, i am using R on windows and i have to do several graphs with axis labels and the axis text thicks has a specified font type, (Arial) and a specified font size. How can i do these? Thank you in advance -- View this message in context: http://www.nabble.com/graph%3A-axis-label-font-tp24463974p24463974.html Sent from the R help mailing list archive at Nabble.com.

Hi, I would like to use a random Forest model to get an idea about which variables from a dataset may have some prognostic significance in a smallish study. The default for the number of trees seems to be 500. I tried changing the default to ntree=2000 or ntree=200 and the results appear identical. Have changed mtry from mtry=5 to mtry=6 successfully. Have seen same problem on both a Windows

Hi list, My attention was drawn to the foreach package by recent posts...I decided to have a look... I'm using R.2.9.1 on Windows, I have downloaded the foreach package today (v 1.2.1), together with iterators (v. 1.0.1) and codetools (v.0.2-2). Full of hope I try the most simple thing of all out of the package vignette : > x <- foreach(i = 1:3) %do% sqrt(i) and get : > Erreur

Hi Colleagues, Could you please help? I get as the output of my calculations following [1] 0.000000e+00 1.890000e-04 3.933000e-05 1.701501e-04 2.040456e-04 [6] 3.119242e-04 2.545665e-04 1.893930e-03 1.303112e-03 9.880183e-04 [11] 1.504378e-03 1.549246e-03 5.877690e-04 4.771359e-04 8.528219e-04 How is it possible to transform the data to get a vector as following 10

Hi , I am using the plot function for some data , and the plot is coming back pure black , with scales on the side . Regards Malcolm [[alternative HTML version deleted]]

Hello, Please forgive me that this question is so basic, but i have not been able to find a solution in any of the basic R introductions, in the R wiki, or in the stats textbook i'm using to learn R. I run R on a macintosh, and i have not been able to load any data files yet. For instance, if I have a data table in a file called schools.txt on my desktop, i've been trying to load the

http://www.nabble.com/file/p24569511/mahalanobis.txt mahalanobis.txt http://www.nabble.com/file/p24569511/concentrations.txt concentrations.txt Dear Forum members, I have a problem calculating mahalanobis distances. My data file mahalanobis.txt and categories file concentrations.txt are attached. I do the following steps: x <- as.matrix(read.table("mahalanobis.txt", header=TRUE))

Hi, I am looking for ways to donwsample one-dimensional vectors. For example, x=sample(1:5, 115, replace=TRUE) How do I downsample this vector to 100 entries? Are there any R functions or packages that provide such functionality. I did find the zoo package and the aggregate() function, but these appear to be rather specific for time-series. Thanks in advance, Jan

Hello,   What function can I use for matrices addition? I couldn’t find any information about it in the manual or in the internet. (A+B suits, when the number of matrixes is small, function sum() doesn’t suit for matrices addition, because it sums all variables in the matrices and produces as an answer single number, not a matrix).   Best regards, Lina [[alternative HTML version

Hi, It might be a primitive question but how it is possible to determine if a variable is initialized in an environment? Suppose that we start a R session and wants to run a script which use the variable i. Which function could evaluate if i is already initialized or not and if not, then ask interactively the user to set it? This is to avoid the error message: object i is not found. Regards,

I am looking for information on experimentation with the use of R in the teaching of statistics and science in schools. Any leads would be very welcome. I am certain that there is such experimentation. I've made this inquiry on r-sig-teaching, with no response. John. John Maindonald email: john.maindonald at anu.edu.au phone : +61 2 (6125)3473 fax : +61 2(6125)5549 Centre

Hi I wrotte this function but when I get the "tmp.xls" file it shows data in a rare way. I mean not appears a matrix with 2000 rows and 100 columns. Can anyone help me, guide me? kim<-function(){ tmp<-randz<-matrix(rnorm(200000, mean=0,sd=0.01 ),2000,100); dim(tmp) write(tmp,file="tmp.xls") Thanks in advance. On the other hand, everytime I execute a function

...kage: bigmemory > kmeans.big.matrix Error: object 'kmeans.big.matrix' not found Does anybody know how to get the kmeans.big.matrix() function? Are there other cluster algorithms out there ready to accept a big.matrix as input? Thanks! -- Michael Knudsen micknudsen at gmail.com http://lifeofknudsen.blogspot.com/

Hi ,everyone , I draw some boxplot figure with the command "boxplot".But in the figure,there are some bubbles at the top part of the figure. Can anyone tell me what the correct meaning of these bubbles?and how to remove it? -- TANG Jie Email: totangjie@gmail.com Tel: 0086-2154896104 Shanghai Typhoon Institute,China [[alternative HTML version deleted]]