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Search found 6 results on 1 pages for 'andrewj'.

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  • breaking out of for loop when running a function inside a for loop

    - by andrewj
    I'm embarrassed that I'm asking this question, but here I go: Suppose you have the following function foo. When I'm running a for loop, I'd like it to skip the remainder of foo when foo initially returns the value of 0. However, break doesn't work when it's inside a function. As it's currently written, I get an error message, no loop to break from, jumping to top level. Any suggestions? foo <- function(x) { y <- x-2 if (y==0) {break} # how do I tell the for loop to skip this z <- y + 100 z } for (i in 1:3) { print(foo(i)) }

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  • breaking out of for loop when running a function inside a for loop in R

    - by andrewj
    I'm embarrassed that I'm asking this question, but here I go: Suppose you have the following function foo. When I'm running a for loop, I'd like it to skip the remainder of foo when foo initially returns the value of 0. However, break doesn't work when it's inside a function. As it's currently written, I get an error message, no loop to break from, jumping to top level. Any suggestions? foo <- function(x) { y <- x-2 if (y==0) {break} # how do I tell the for loop to skip this z <- y + 100 z } for (i in 1:3) { print(foo(i)) }

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  • fastest way convert tab-delimited file to csv in linux

    - by andrewj
    I have a tab-delimited file that has over 200 million lines. What's the fastest way in linux to convert this to a csv file? This file does have multiple lines of header information which I'll need to strip out down the road, but the number of lines of header is known. I have seen suggestions for sed and gawk, but I wonder if there is a "preferred" choice.

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  • converting a matrix to a list

    - by andrewj
    Suppose I have a matrix foo as follows: foo <- cbind(c(1,2,3), c(15,16,17)) > foo [,1] [,2] [1,] 1 15 [2,] 2 16 [3,] 3 17 I'd like to turn it into a list that looks like [[1]] [1] 1 15 [[2]] [1] 2 16 [[3]] [1] 3 17 You can do it as follows: lapply(apply(foo, 1, function(x) list(c(x[1], x[2]))), function(y) unlist(y)) I'm interested in an alternative method that isn't as complicated. Note, if you just do apply(foo, 1, function(x) list(c(x[1], x[2]))), it returns a list within a list, which I'm hoping to avoid.

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  • determining name of object loaded in R

    - by andrewj
    Imagine you have an object foo that you saved as saved.file.rda as follows: foo <- 'a' save(foo, file='saved.file.rda') Suppose you load saved.file.rda into an environment with multiple objects but forgot the name of the object that is in saved.file.rda. Is there a way in R to determine that name? You can do it the following way, which seems a little clunky: bar <- load('saved.file.rda') eval(parse(text=bar)) # this will pull up the object that was in saved.file.rda However, is there a better way of doing this?

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