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Search found 15 results on 1 pages for 'stevejb'.

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• Getting vga_switcheroo with ATI Mobility Radeon 5650 HD to work

  - by stevejb

  Hello! I have a new HP dv7 laptop with ATI Mobility Radeon HD 5650 graphics card, and also Intel graphics (switchable). I have done the following and want to understand what is going on with my graphics driver Resized windows 7 and did fresh install of 10.10 Booted into 10.10 and things seemed to be working okay Enabled ATI graphics, and was…

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• What is the *right* way to use gnome-shell integrated chat?

  - by stevejb

  Please bear with me as I am still figuring out how to use gnome-shell. My question concerns how to use the integrated chat correctly. I have the following questions: 1) When people chat with me, it pops up as a notification on the hidden bar at the bottom of the screen, and then that chat stays there so I can access it later. How do I…

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• What is the optimal way to run a set of regressions in R.

  - by stevejb

  Assume that I have sources of data X and Y that are indexable, say matrices. And I want to run a set of independent regressions and store the result. My initial approach would be results = matrix(nrow=nrow(X), ncol=(2)) for(i in 1:ncol(X)) { matrix[i,] = coefficients(lm(Y[i,] ~ X[i,]) } But, loops are bad, so I could do it…

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• What is the best way to run a loop of regressions in R?

  - by stevejb

  Assume that I have sources of data X and Y that are indexable, say matrices. And I want to run a set of independent regressions and store the result. My initial approach would be results = matrix(nrow=nrow(X), ncol=(2)) for(i in 1:ncol(X)) { matrix[i,] = coefficients(lm(Y[i,] ~ X[i,]) } But, loops are bad, so I could do it…

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• In AucTeX, new item in itemized list after comment results in commented next item

  - by stevejb

  In AucTeX, when editing an itemized list: \begin{itemize} \item My item % note to self \end{itemize} when I do C-c C-j after 'self' I get: \begin{itemize} \item My item % note to self % \item \end{itemize} when I want: \begin{itemize} \item My item % note to self \item \end{itemize} Is there a setting a can modify to…

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• using gsub to modify output of xtable command

  - by stevejb

  Hello, my.mat <- cbind(1:5, rnorm(5), 6:10, rnorm(5)) colnames(my.mat) <- c("Turn", "Draw","Turn", "Draw") print(xtable(my.mat)) yields \begin{table}[ht] \begin{center} \begin{tabular}{rrrrr} \hline & Turn & Draw & Turn & Draw \\ \hline 1 & 1.00 & -0.72 & 6.00 & 0.91 \\ 2 &…

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• editing Rnw in Emacs, gets confused if in math mode or not

  - by stevejb

  When editing .Rnw files with emacs, sometimes it gets confused as to if I am in math mode or not. Then, the syntax highlighting gets messed up, and C-f-i inserts \textit{} and \mathit{} opposite to how it normally should. Is seems like there is some bool storing the state of math mode or not, and it gets inadvertently flipped.…

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• using R to estimate finite mixture model with underlying Markov process

  - by stevejb

  Hello, My apologies if this is more of a statistics question than an R question. I am trying to estimate the following model in R. y_t = mu0 (1 - S_t) + mu1 S_t + e_t e_t ~ N(0, sigma_t^2) sigma_t^2 = sigma_0^2 (1 - S_t) + sigma_1^2 S_t where mu_t = mu0 if S_t = 0, mu_t = mu1 if S_t = 1, and S_t is a Markov process,…

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• R library for discrete Markov chain simulation

  - by stevejb

  Hello, I am looking for something like the 'msm' package, but for discrete Markov chains. For example, if I had a transition matrix defined as such Pi <- matrix(c(1/3,1/3,1/3, 0,2/3,1/6, 2/3,0,1/2)) for states A,B,C. How can I simulate a Markov chain according to that transition matrix? Thanks,

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• can lapply not modify variables in a higher scope

  - by stevejb

  I often want to do essentially the following: mat <- matrix(0,nrow=10,ncol=1) lapply(1:10, function(i) { mat[i,] <- rnorm(1,mean=i)}) But, I would expect that mat would have 10 random numbers in it, but rather it has 0. (I am not worried about the rnorm part. Clearly there is a right way to do that. I am worry…

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• In AuxTex, new item in itemized list after comment results in commented next item

  - by stevejb

  In AucTex, when editing an itemized list \begin{itemize} \item My item % note to self \end{itemize} When I do C-c C-j after 'self' I get \begin{itemize} \item My item % note to self % \item \end{itemize} when I want \begin{itemize} \item My item % note to self \item \end{itemize} Is there a setting a can…

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• how to wrap a function that only takes individual elements to make it take a list

  - by stevejb

  Hello, Say I have a function handed to me that I cannot change and must use as is. This function takes several objects in the form of oldFunction( object1, object2, object3, ...) where ... are other arguments. I want to write a wrapper to take a list of objects. My idea was this. sjb.ListWrapper <-…

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• In ESS/Emacs, how can I get the R process buffer to scroll to the bottom after a C-c C-j or C-c C-r

  - by stevejb

  Hello, In ESS when I am evaluating chunks of code in a .R file using C-c C-j or C-c C-r (to send the line or region to a running R process), how can I get the R buffer to scroll down automatically, such that after evaluating a region the cursor is at the bottom, at the prompt? Thanks.

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• how to aggregate this data in R

  - by stevejb

  Hello, I have a data frame in R with the following structure. > testData date exch.code comm.code oi 1 1997-12-30 CBT 1 468710 2 1997-12-23 CBT 1 457165 3 1997-12-19 CBT 1 461520 4 1997-12-16 CBT 1 444190 5 …

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• can the point have a longer history

  - by stevejb

  Hello, I often find myself in the following situation. Say I was editing a file with this contents \begin{itemize} \item \end{itemize} I really like http://stackoverflow.com ! And say the point was after the word \item. What I want to do is select http://stackoverflow.com , C-w it, and go back to…

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