Results for: "tally"

Collects (as in Enumerable#collect) over the elements of this vector and v in conjunction.

Like Array#collect.

Like Array#collect!

Returns a new vector with the same direction but with norm 1.

v = Vector[5,8,2].normalize
# => Vector[0.5184758473652127, 0.8295613557843402, 0.20739033894608505]
v.norm => 1.0

Looks up the first IP address for name.

Looks up all IP address for name.

Looks up the first IP address for name.

Looks up all IP address for name.

Basically the same as ::new. However, if class Thread is subclassed, then calling start in that subclass will not invoke the subclass’s initialize method.

Causes the given thread to exit, see also Thread::exit.

count = 0
a = Thread.new { loop { count += 1 } }
sleep(0.1)       #=> 0
Thread.kill(a)   #=> #<Thread:0x401b3d30 dead>
count            #=> 93947
a.alive?         #=> false

Waits for thr to complete, using join, and returns its value or raises the exception which terminated the thread.

a = Thread.new { 2 + 2 }
a.value   #=> 4

b = Thread.new { raise 'something went wrong' }
b.value   #=> RuntimeError: something went wrong

Terminates thr and schedules another thread to be run, returning the terminated Thread. If this is the main thread, or the last thread, exits the process.

Returns the status of thr.

"sleep"

Returned if this thread is sleeping or waiting on I/O

"run"

When this thread is executing

"aborting"

If this thread is aborting

false

When this thread is terminated normally

nil

If terminated with an exception.

a = Thread.new { raise("die now") }
b = Thread.new { Thread.stop }
c = Thread.new { Thread.exit }
d = Thread.new { sleep }
d.kill                  #=> #<Thread:0x401b3678 aborting>
a.status                #=> nil
b.status                #=> "sleep"
c.status                #=> false
d.status                #=> "aborting"
Thread.current.status   #=> "run"

See also the instance methods alive? and stop?

Returns true if thr is running or sleeping.

thr = Thread.new { }
thr.join                #=> #<Thread:0x401b3fb0 dead>
Thread.current.alive?   #=> true
thr.alive?              #=> false

See also stop? and status.

Wakes up the first thread in line waiting for this lock.

Returns internal information of TracePoint.

The contents of the returned value are implementation specific. It may be changed in future.

This method is only for debugging TracePoint itself.

Return the tag object which was called for.

Return the return value which was called for.

Create a new BigDecimal object.

initial

The initial value, as an Integer, a Float, a Rational, a BigDecimal, or a String.

If it is a String, spaces are ignored and unrecognized characters terminate the value.

digits

The number of significant digits, as an Integer. If omitted or 0, the number of significant digits is determined from the initial value.

The actual number of significant digits used in computation is usually larger than the specified number.

exception

Whether an exception should be raised on invalid arguments. true by default, if passed false, just returns nil for invalid.

Exceptions

TypeError

If the initial type is neither Integer, Float, Rational, nor BigDecimal, this exception is raised.

TypeError

If the digits is not an Integer, this exception is raised.

ArgumentError

If initial is a Float, and the digits is larger than Float::DIG + 1, this exception is raised.

ArgumentError

If the initial is a Float or Rational, and the digits value is omitted, this exception is raised.

Returns x/y or arg as a Rational.

Rational(2, 3)   #=> (2/3)
Rational(5)      #=> (5/1)
Rational(0.5)    #=> (1/2)
Rational(0.3)    #=> (5404319552844595/18014398509481984)

Rational("2/3")  #=> (2/3)
Rational("0.3")  #=> (3/10)

Rational("10 cents")  #=> ArgumentError
Rational(nil)         #=> TypeError
Rational(1, nil)      #=> TypeError

Rational("10 cents", exception: false)  #=> nil

Syntax of the string form:

string form = extra spaces , rational , extra spaces ;
rational = [ sign ] , unsigned rational ;
unsigned rational = numerator | numerator , "/" , denominator ;
numerator = integer part | fractional part | integer part , fractional part ;
denominator = digits ;
integer part = digits ;
fractional part = "." , digits , [ ( "e" | "E" ) , [ sign ] , digits ] ;
sign = "-" | "+" ;
digits = digit , { digit | "_" , digit } ;
digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
extra spaces = ? \s* ? ;

See also String#to_r.

Evaluates the Ruby expression(s) in string. If binding is given, which must be a Binding object, the evaluation is performed in its context. If the optional filename and lineno parameters are present, they will be used when reporting syntax errors.

def get_binding(str)
  return binding
end
str = "hello"
eval "str + ' Fred'"                      #=> "hello Fred"
eval "str + ' Fred'", get_binding("bye")  #=> "bye Fred"

Returns a new array with the results of running block once for every element in enum.

If no block is given, an enumerator is returned instead.

(1..4).map { |i| i*i }      #=> [1, 4, 9, 16]
(1..4).collect { "cat"  }   #=> ["cat", "cat", "cat", "cat"]

Returns first n elements from enum.

a = [1, 2, 3, 4, 5, 0]
a.take(3)             #=> [1, 2, 3]
a.take(30)            #=> [1, 2, 3, 4, 5, 0]

Computes the arctangent of decimal to the specified number of digits of precision, numeric.

If decimal is NaN, returns NaN.

BigMath.atan(BigDecimal('-1'), 16).to_s
#=> "-0.785398163397448309615660845819878471907514682065e0"

Determines the equality of two numbers by comparing to zero, or using the epsilon value