Results for: "minmax"

Log an INFO message.

message

The message to log; does not need to be a String.

progname

In the block form, this is the progname to use in the log message. The default can be set with progname=.

block

Evaluates to the message to log. This is not evaluated unless the logger’s level is sufficient to log the message. This allows you to create potentially expensive logging messages that are only called when the logger is configured to show them.

Examples

logger.info("MainApp") { "Received connection from #{ip}" }
# ...
logger.info "Waiting for input from user"
# ...
logger.info { "User typed #{input}" }

You’ll probably stick to the second form above, unless you want to provide a program name (which you can do with progname= as well).

Return

See add.

Create a matrix by combining matrices entrywise, using the given block

x = Matrix[[6, 6], [4, 4]]
y = Matrix[[1, 2], [3, 4]]
Matrix.combine(x, y) {|a, b| a - b} # => Matrix[[5, 4], [1, 0]]

The index method is specialized to return the index as [row, column] It also accepts an optional selector argument, see each for details.

Matrix[ [1,2], [3,4] ].index(&:even?) # => [0, 1]
Matrix[ [1,1], [1,1] ].index(1, :strict_lower) # => [1, 0]

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

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

Returns true if this is a singular matrix.

Returns the inverse of the matrix.

Matrix[[-1, -1], [0, -1]].inverse
  => -1  1
      0 -1

Overrides Object#inspect

Returns true iff all of vectors are linearly independent.

Vector.independent?(Vector[1,0], Vector[0,1])
  => true

Vector.independent?(Vector[1,2], Vector[2,4])
  => false

Returns true iff all of vectors are linearly independent.

Vector[1,0].independent?(Vector[0,1])
  => true

Vector[1,2].independent?(Vector[2,4])
  => false

Returns the modulus (Pythagorean distance) of the vector.

Vector[5,8,2].r => 9.643650761

Like Vector#collect2, but returns a Vector instead of an Array.

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

Overrides Object#inspect

Returns an incremented value of default according to arg.

Puts option summary into to and returns to. Yields each line if a block is given.

to

Output destination, which must have method <<. Defaults to [].

width

Width of left side, defaults to @summary_width.

max

Maximum length allowed for left side, defaults to width - 1.

indent

Indentation, defaults to @summary_indent.