Used to filter unwanted trace output
Example which only outputs lines of code executed within the Kernel class:
Tracer.add_filter do |event, file, line, id, binding, klass, *rest| "Kernel" == klass.to_s end
Creates a new compiler for ERB. See ERB::Compiler.new for details
Returns a new binding each time near TOPLEVEL_BINDING for runs that do not specify a binding.
Return the appropriate error message in POSIX-defined format. If no error has occurred, returns nil.
Returns true if the ipaddr is an IPv4-compatible IPv6 address.
Returns a new ipaddr built by converting the native IPv4 address into an IPv4-compatible IPv6 address.
Returns the names of the binding’s local variables as symbols.
def foo a = 1 2.times do |n| binding.local_variables #=> [:a, :n] end end
This method is the short version of the following code:
binding.eval("local_variables")
Set date-time format.
datetime_format
A string suitable for passing to strftime.
Returns the date format being used. See datetime_format=
Returns the submatrix obtained by deleting the specified row and column.
Matrix.diagonal(9, 5, -3, 4).first_minor(1, 2)
=> 9 0 0
0 0 0
0 0 4
Hadamard product
Matrix[[1,2], [3,4]].hadamard_product(Matrix[[1,2], [3,2]])
=> 1 4
9 8
Returns an array of the row vectors of the matrix. See Vector.
Returns an array of the column vectors of the matrix. See Vector.
Returns the inner product of this vector with the other.
Vector[4,7].inner_product Vector[10,1] => 47
Returns a Hash using named capture.
A key of the hash is a name of the named captures. A value of the hash is a string of last successful capture of corresponding group.
m = /(?<a>.)(?<b>.)/.match("01") m.named_captures #=> {"a" => "0", "b" => "1"} m = /(?<a>.)(?<b>.)?/.match("0") m.named_captures #=> {"a" => "0", "b" => nil} m = /(?<a>.)(?<a>.)/.match("01") m.named_captures #=> {"a" => "1"} m = /(?<a>x)|(?<a>y)/.match("x") m.named_captures #=> {"a" => "x"}