similar to: shifting data in matrix by n rows

Hi everyone, I want to perform an operation on a matrx that outputs the product of successive pairs of rows. For example: calculating the product between rows 1 & 2; 3 & 4; 5 & 6...etc. Does anyone know of any readily available functions that can do this? Thanks, rcoder -- View this message in context: http://www.nabble.com/product-of-successive-rows-tp18681259p18681259.html

I'm wondering what's the best way to shift a huge matrix left or right. My current implementation is the following: shiftMatrixL <- function(X, shift, padding=0) { cbind(X[, -1:-shift], matrix(padding, dim(X)[1], shift)) } X <- shiftMatrixL(X, 1)*3 + shiftMatrixL(X,2)*5... However, it's still slow due to heavy use of this function. The resulting matrix will only be read once

Hi everyone, I have a rollapply statement that applies a function, in steps, over a data matrix as follows: #Code start testm<-rollapply(mat, 100, by=100, min, na.rm=F) #Code end This moves down matrix 'mat' and calculates the minimum value over a 100 row range, every 100 rows (i.e. no overlaps). NAs are not removed. I want to modify this statement somehow so that the rollapply()

Hi everyone, I'm running some code containing an outer and inner loop, to fill cells in a 2500x1500 results matrix. I left my program running overnight, and it was still running when I checked 17 hours later. I have tested the operation on a smaller matrix and it executes fine, so I believe there is nothing wrong with the code. I was just wondering if this is normal program execution speed

Hi everyone, I'm trying to create an "if" conditional statement with two conditions, whereby the statement is true when condition 1 AND condition 2 are met: code structure: if ?AND? (a[x,y] <condition1>, a[x,y] <condition2>) I've trawled through the help files, but I cannot find an example of the syntax for incorporating an AND in a conditional IF statement.

Hi everyone, Is there a way to vary the increment size in a for loop? For e.g. when incrementing in steps greater than unity. Thanks, rcoder -- View this message in context: http://www.nabble.com/increment-size-in-for-loop-tp18893893p18893893.html Sent from the R help mailing list archive at Nabble.com.

Hi everyone, I'm having trouble applying the Cor() function to two matrices, both of which contain NAs. I am doing the following: a<-cor(m1, m2, use="complete.obs") ... and I get the following error message: Error in cor(m1, m2, use = "complete.obs") : no complete element pairs Does anyone know how I can apply a correlation, ignoring any NAs? Thanks, rcoder --

Hi everyone, I want to extract data from a data set according to dates specified in a vector. I have created a blank matrix with row names (dates) that I want to extract from the full data set. I have then performed a merge to try to o/p rows corresponding to common dates to a results matrix, but the operation did not fill the results matrix. Coulc anyone offer any advice to assist with this

Hi everyone, I'm trying to calculate correlation coefficients between corresponding columns in two matrices with identical dimensions but different data. The problem is that the matrices contain NAs in different locations. I am using the following code to try to calculate correlations between complete sets of data: #Code start maxcol<-ncol(mat1) for (i in 1:maxcol) {

Hi guys, I am trying to shift down the "ylab" of my plot but can't find how to do it. I tried to tune "mar" but it enable more room for the labels to be displayed but it does not move to "ylab" as I would like. Is there a way with "par" to shift down my "ylab" ?? Cheers -- View this message in context:

Hi everyone, I have a matrix that has a combination of zeros and NAs. When I perform certain calculations on the matrix, the zeros generate "Inf" values. Is there a way to either convert the zeros in the matrix to NAs, or only perform the calculations if not zero (i.e. like using something similar to an !all(is.na() construct)? Thanks, rcoder -- View this message in context:

Hi everyone, I posted something similar to this in reply to another post, but there seems to be a problem getting it onto the board, so I'm starting a new post. I am trying to use conditional formatting to select non-zero and non-NaN values from a matrix and pass them into another matrix. The problem is that I keep encountering an error message indicating the ":missing value where

Hi everyone, I am trying to apply linear regression to adjacent columns in a matrix (i.e. col1~col2; col3~col4; etc.). The columns in my matrix come with identifiers at the top of each column, but when I try to use these identifiers to reference the columns in the regression function using rollapply(), the columns are not recognised and the regression breaks down. Is there a more robust way to

Hi everyone, I'm experiencing difficulty getting the results I want when I use a nested for loop. I have a data set to which I perform some calculations, and then try to apply a regression over a rolling window. The code runs, but the regression results I am getting (intercept and slope) are simply the same, repeated again and again in the results matrix. The regression does not seem to be

Hi everyone, I'm trying to use the acf() function to calculate the autocorrelation of each column in a matrix. The trouble is that I can only seem to get the function to work if I extract the data in the column into a separate matrix and then apply the acf() function to this column. I have something like this: acf(mat,lag.max=10,na.action=na.pass) ...but I would really like to apply the

Hey list, Does anybody knows a command to centre the tick mark labels exactly between the tick points (right shift)? And then to exclude the last tick label on the right? I know one can shift them using the 'hadj' option in par. But I am wondering if there is a more convenient command! Thanks a lot!! Stefan [[alternative HTML version deleted]]

The documentation for SHL, LSHR, and ASHR is unclear. What is the result of shifting by the number of bits in the left operand. For example, <result> = shl i32 1, 32 <result> = ashr i32 1, 32 <result> = lshr i32 1, 32

hi, i have a smba server working as pdc. users are managed using smbpasswd. i want to shift the server to a new machine (without changing any configuration). which all configuration files i have to copy to the new machine. greetings, -- Anu Bhaskar Linux Administrator Spectrum Softtech Solutions Pvt. Ltd. Tel: 914842345922 www.spectrum.net.in

Hi everyone, I've created a dll for a fortran subroutine, and when I call the subroutine in R (via a wrapped function) a standard program shutdown windows error prompt immediately pops up: the program has encountered a problem and needs to be shut down... send message / don't send message to MS... etc. When I click "Don't send", the R consol does not then shut down, and

Hello List, I was wondering if there is a way to shift the screens in linux. I got a kvn yesterday, and have a problem when switching from computers, where the screen is slightly shifted on one of them. I have to go into the monitor configuration screen and move the screen to the right to center it on one of the computers. Then when moving back to the other computer, that screen isn't