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Returns the adjugate of the matrix.

Matrix[ [7,6],[3,9] ].adjugate
  => 9 -6
     -3 7

Returns true if this is a diagonal matrix. Raises an error if matrix is not square.

Returns true if this is a permutation matrix Raises an error if matrix is not square.

Returns true if this is a symmetric matrix. Raises an error if matrix is not square.

Returns the determinant of the matrix.

Beware that using Float values can yield erroneous results because of their lack of precision. Consider using exact types like Rational or BigDecimal instead.

Matrix[[7,6], [3,9]].determinant
  => 45

deprecated; use Matrix#determinant

Returns the conjugate of the matrix.

Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]]
  => 1+2i   i  0
        1   2  3
Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]].conjugate
  => 1-2i  -i  0
        1   2  3

Returns the imaginary part of the matrix.

Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]]
  => 1+2i  i  0
        1  2  3
Matrix[[Complex(1,2), Complex(0,1), 0], [1, 2, 3]].imaginary
  =>   2i  i  0
        0  0  0

Creates a vector from an Array. The optional second argument specifies whether the array itself or a copy is used internally.

Initializes a new instance and evaluates the optional block in context of the instance. Arguments args are passed to new, see there for description of parameters.

This method is deprecated, its behavior corresponds to the older new method.

Parses command line arguments argv in order when environment variable POSIXLY_CORRECT is set, and in permutation mode otherwise.

Same as parse, but removes switches destructively. Non-option arguments remain in argv.

Parses environment variable env or its uppercase with splitting like a shell.

env defaults to the basename of the program.

Returns the number of elements in the match array.

m = /(.)(.)(\d+)(\d)/.match("THX1138.")
m.length   #=> 5
m.size     #=> 5

This is a convenience method which is same as follows:

begin
  q = PrettyPrint.new(output, maxwidth, newline, &genspace)
  ...
  q.flush
  output
end

Returns true if value is a prime number, else returns false.

Parameters

value

an arbitrary integer to be checked.

generator

optional. A pseudo-prime generator.

Returns true if self is a prime number, else returns false.

Iterates the given block int times, passing in values from zero to int - 1.

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

5.times do |i|
  print i, " "
end
#=> 0 1 2 3 4

Returns the smallest number than or equal to int in decimal digits (default 0 digits).

Precision may be negative. Returns a floating point number when ndigits is positive, self for zero, and truncate up for negative.

1.truncate        #=> 1
1.truncate(2)     #=> 1.0
15.truncate(-1)   #=> 10

Returns a new set that is a copy of the set, flattening each containing set recursively.

Equivalent to Set#flatten, but replaces the receiver with the result in place. Returns nil if no modifications were made.