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Java resource as file
... a File object
File dir = new File(dir_url.toURI());
// List the directory
String files = dir.list()
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How to convert a data frame column to numeric type?
... char_fac = factor(letters[1:5]),
num = 1:5, stringsAsFactors = FALSE)
Let us have a glance at data.frame
> d
char fake_char fac char_fac num
1 a 1 1 a 1
2 b 2 2 b 2
3 c 3 3 c 3
4 d 4 ...
round() doesn't seem to be rounding properly
...
According to the docs, this style of string formatting will eventually go away. The new-style format would be "{:.1f}".format(n)
– whereswalden
Aug 7 '14 at 12:56
...
Getting the last element of a list
...at should happen when attempting to get an element from an empty list. For Strings astr[-1:] could be a valid approach since it returns the same type as astr[-1], but I don't think the ':' helps to deal with empty lists (and the question is about lists). If the idea is to use "alist[-1:]" as a condi...
returning a Void object
...<T> action) {
return action.execute();
}
you can call it like
String result = executeAction(new Action<String>() {
@Override
public String execute() {
//code here
return "Return me!";
}
});
or, for the void action (note that you're not assigning the r...
jQuery: Test if checkbox is NOT checked
...roperty will always be a boolean since it is a computed property and not a string, so you can get away with using ==. It is wise to always use === though since this is not always the case
– Pablo Mescher
Oct 27 '16 at 20:42
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What is the source code of the “this” module doing?
...r) chars.
print "".join([d.get(c, c) for c in s])
Prints the translated string.
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How to get UILabel to respond to tap?
...
Swift 2.0:
I am adding a nsmutable string as sampleLabel's text, enabling user interaction, adding a tap gesture and trigger a method.
override func viewDidLoad() {
super.viewDidLoad()
let newsString: NSMutableAttributedString = NSMutableAttributedSt...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
...veRecord::Migration[5.2]
def change
create_table :users do |t|
t.string :name, null: false # Notice here, NOT NULL definition
t.string :email, null: false
t.string :password, null: false
t.integer :created_by
t.integer :updated_by
t.datetime :created_at
t.date...
What is the difference between a HashMap and a TreeMap? [duplicate]
...rted key store one another difference is with TreeMap, developer can give (String.CASE_INSENSITIVE_ORDER) with String keys, so then the comparator ignores case of key while performing comparison of keys on map access. This is not possible to give such option with HashMap - it is always case sensitiv...