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29 results for “from:David Romano”

memory leak using 'apply'? [was: how to parallelize 'apply' across multiple cores on a Mac]
David Romano · May 4, 2013 · r-help

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using ifelse to remove NA's from specific columns of a data frame containing strings and numbers
David Romano · Nov 15, 2012 · r-help

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using ifelse to remove NA's from specific columns of a data frame containing strings and numbers
David Romano · Nov 15, 2012 · r-help

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splitting character vectors into multiple vectors using strsplit
David Romano · Sep 7, 2012 · r-help

Hi folks, Suppose I create the character vector charvec by > charvec<-c("a1.b1","a2.b2") > charvec [1] "a1.b1" "a2.b2" and then I use strsplit on charvec as follows: > splitlist<-strsplit(charvec,split=".",fixed=TRUE) > splitlist [[1]] [1...

ways of getting around allocMatrix limit?
David Romano · Jul 31, 2012 · r-help

I need to multiply to very large, nonsparse matrices, and so get the error "allocMatrix: too many elements specified". Is there a way to set the limit for allocMatrix? In my case, the two matrices, A and B, are nxm...

ggplot2: how to jitter spaghetti plot so slopes are preserved
David Romano · Aug 20, 2014 · r-help

Hi, Suppose I have a the data frame given by: > dput(toy.df) structure(list(id = c(1, 2, 1, 2), time = c(1L, 1L, 2L, 2L), value = c(1, 2, 2, 3)), .Names = c("id", "time", "value"), row.names...

using 'apply' to apply princomp to an array of datasets
David Romano · Dec 12, 2012 · r-help

Sorry, I just realized I didn't send the message below in plain text. -David Romano On Wed, Dec 12, 2012 at 9:14 AM, David Romano <dromano at stanford.edu> wrote: > > Hi everyone, > > Suppose I have a 3D array...

how to parallelize 'apply' across multiple cores on a Mac
David Romano · May 4, 2013 · r-help

(I neglected to use reply-all.) ---------- Forwarded message ---------- From: David Romano <dromano at stanford.edu> Date: Sat, May 4, 2013 at 11:25 AM Subject: Re: [R] how to parallelize 'apply' across multiple cores on a Mac To: Charles Berry...

using 'apply' to apply princomp to an array of datasets
David Romano · Dec 12, 2012 · r-help

Thank you, Rui! This is incredibly helpful -- anonymous functions are new to me, and I appreciate being shown how useful they are. Best regards, David On Wed, Dec 12, 2012 at 10:12 AM, Rui Barradas <ruipbarradas at sapo.pt...

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