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jQuery map vs. each

... 270 The each method is meant to be an immutable iterator, where as the map method can be used as a...
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Clojure: cons (seq) vs. conj (list)

...guments to insert into a collection, while cons takes just one: (conj '(1 2 3) 4 5 6) ; => (6 5 4 1 2 3) (cons 4 5 6 '(1 2 3)) ; => IllegalArgumentException due to wrong arity Another difference is in the class of the return value: (class (conj '(1 2 3) 4)) ; => clojure.lang.Persistent...
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Emulate ggplot2 default color palette

What function can I use to emulate ggplot2's default color palette for a desired number of colors. For example, an input of 3 would produce a character vector of HEX colors with these colors: ...
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Select first 4 rows of a data.frame in R

...et the rows 5 to 7? – Bustergun May 21 '18 at 9:38 You can use the "index" answer pointed out elsewhere. In this situa...
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How to get Scala List from Java List?

... EDIT: Note that this is deprecated since 2.12.0. Use JavaConverters instead. (comment by @Yaroslav) Since Scala 2.8 this conversion is now built into the language using: import scala.collection.JavaConversions._ ... lst.toList.foreach{ node => .... } works. ...
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Difference between numpy.array shape (R, 1) and (R,)

... how to interpret the data buffer. For example, if we create an array of 12 integers: >>> a = numpy.arange(12) >>> a array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]) Then a consists of a data buffer, arranged something like this: ┌────┬────┬──...
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Grep regex NOT containing string

... answered May 2 '12 at 10:10 beerbajaybeerbajay 16.2k44 gold badges4848 silver badges7070 bronze badges ...
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How to add new item to hash

...eate the hash: hash = {:item1 => 1} Add a new item to it: hash[:item2] = 2 share | improve this answer | follow | ...
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R - Concatenate two dataframes?

... 227 You want "rbind". b$b <- NA new <- rbind(a, b) rbind requires the data frames to have...
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How would I get a cron job to run every 30 minutes?

... | edited Sep 27 '11 at 13:45 Tim Cooper 138k3434 gold badges286286 silver badges249249 bronze badges ...