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"}
Dup internal hash.
Returns self if no arguments are given. Otherwise, converts the set to another with klass.new(self, *args, &block).
In subclasses, returns klass.new(self, *args, &block) unless overridden.
Sets the system path (the Shell instance’s PATH environment variable).
path should be an array of directory name strings.
Compiled source code (String) on *eval methods on the :script_compiled event. If loaded from a file, it will return nil.
Returns a Method of superclass which would be called when super is used or nil if there is no method on superclass.
Returns a Method of superclass which would be called when super is used or nil if there is no method on superclass.
Returns an array of the names of the thread-local variables (as Symbols).
thr = Thread.new do Thread.current.thread_variable_set(:cat, 'meow') Thread.current.thread_variable_set("dog", 'woof') end thr.join #=> #<Thread:0x401b3f10 dead> thr.thread_variables #=> [:dog, :cat]
Note that these are not fiber local variables. Please see Thread#[] and Thread#thread_variable_get for more details.
Returns true if the given string (or symbol) exists as a thread-local variable.
me = Thread.current me.thread_variable_set(:oliver, "a") me.thread_variable?(:oliver) #=> true me.thread_variable?(:stanley) #=> false
Note that these are not fiber local variables. Please see Thread#[] and Thread#thread_variable_get for more details.
Returns an arbitrary seed value. This is used by Random.new when no seed value is specified as an argument.
Random.new_seed #=> 115032730400174366788466674494640623225
Returns the number of threads waiting on the queue.