Snippets of code for things you do all the time in R

Re:Snippets of code for things you do all the time in R by hessenwolf on Thursday January 13, 2011 @07:19AM (#2099569)

My problem is that between work in work and work in startup I need to write in about 8 languages.

This applies in all languages:

vec1 = rnorm(100)

system.time(vec1)

mean(vec1)

And, I can get my colleagues to fix it when I screw up, even though they are not R-heads.

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Re:Snippets of code for things you do all the time in R by ltjohnson on Thursday January 13, 2011 @11:58AM (#2100417)

You gotta do what you gotta do, but your example probably doesn't do what you want in R.

  > system.time(vec1 <- rnorm(1000000))
     user  system elapsed 
    0.200   0.000   0.199

My computer takes .2 seconds to generate the million random normals and assign them to vec1.

  > vec1 = rnorm(1000000)
  > system.time(vec1)
     user  system elapsed 
        0       0       0

My computer only takes 0 seconds to evaluate the existing vec1 of length one million.

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Re:Snippets of code for things you do all the time in R by hessenwolf on Thursday January 13, 2011 @12:19PM (#2100510)

Ah - sorry - I was being a bit t'ick, and didn't twig the time thing. Should I require it, I will keep it in mind. Thank you.

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