Info: (octave) Integer Data Types

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octave: Integer Data Types

 
 4.4 Integer Data Types
 ======================
 
 Octave supports integer matrices as an alternative to using double
 precision.  It is possible to use both signed and unsigned integers
 represented by 8, 16, 32, or 64 bits.  It should be noted that most
 computations require floating point data, meaning that integers will
 often change type when involved in numeric computations.  For this
 reason integers are most often used to store data, and not for
 calculations.
 
    In general most integer matrices are created by casting existing
 matrices to integers.  The following example shows how to cast a matrix
 into 32 bit integers.
 
      float = rand (2, 2)
           ⇒ float = 0.37569   0.92982
                      0.11962   0.50876
      integer = int32 (float)
           ⇒ integer = 0  1
                        0  1
 
 As can be seen, floating point values are rounded to the nearest integer
 when converted.
 
  -- : isinteger (X)
      Return true if X is an integer object (int8, uint8, int16, etc.).
 
      Note that ‘isinteger (14)’ is false because numeric constants in
      Octave are double precision floating point values.
 
      See also: isfloat XREFisfloat, ischar XREFischar,
      islogical XREFislogical, isnumeric XREFisnumeric,
      isa XREFisa.
 
  -- : int8 (X)
      Convert X to 8-bit integer type.
 
DONTPRINTYET       See also: uint8 XREFuint8, int16 XREFint16, *noteDONTPRINTYET DONTPRINTYET       See also: uint8 XREFuint8, int16 XREFint16, 
      uint16 XREFuint16, int32 XREFint32, *noteuint32:
DONTPRINTYET DONTPRINTYET       See also: uint8 XREFuint8, int16 XREFint16, 
      uint16 XREFuint16, int32 XREFint32, uint32

      XREFuint32, int64 XREFint64, uint64 XREFuint64.
 
  -- : uint8 (X)
      Convert X to unsigned 8-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, int16 XREFint16, *noteDONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, int16 XREFint16, 
      uint16 XREFuint16, int32 XREFint32, *noteuint32:
DONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, int16 XREFint16, 
      uint16 XREFuint16, int32 XREFint32, uint32

      XREFuint32, int64 XREFint64, uint64 XREFuint64.
 
  -- : int16 (X)
      Convert X to 16-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      uint16 XREFuint16, int32 XREFint32, *noteuint32:
DONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      uint16 XREFuint16, int32 XREFint32, uint32

      XREFuint32, int64 XREFint64, uint64 XREFuint64.
 
  -- : uint16 (X)
      Convert X to unsigned 16-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, int32 XREFint32, uint32 XREFuint32,
      int64 XREFint64, uint64 XREFuint64.
 
  -- : int32 (X)
      Convert X to 32-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, uint16 XREFuint16, *noteuint32:
DONTPRINTYET DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, uint16 XREFuint16, uint32

      XREFuint32, int64 XREFint64, uint64 XREFuint64.
 
  -- : uint32 (X)
      Convert X to unsigned 32-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, uint16 XREFuint16, int32 XREFint32,
      int64 XREFint64, uint64 XREFuint64.
 
  -- : int64 (X)
      Convert X to 64-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, uint16 XREFuint16, int32 XREFint32,
      uint32 XREFuint32, uint64 XREFuint64.
 
  -- : uint64 (X)
      Convert X to unsigned 64-bit integer type.
 
DONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, *noteDONTPRINTYET       See also: int8 XREFint8, uint8 XREFuint8, 
      int16 XREFint16, uint16 XREFuint16, int32 XREFint32,
      uint32 XREFuint32, int64 XREFint64.
 
  -- : intmax (TYPE)
      Return the largest integer that can be represented in an integer
      type.
 
      The variable TYPE can be
 
      ‘int8’
           signed 8-bit integer.
 
      ‘int16’
           signed 16-bit integer.
 
      ‘int32’
           signed 32-bit integer.
 
      ‘int64’
           signed 64-bit integer.
 
      ‘uint8’
           unsigned 8-bit integer.
 
      ‘uint16’
           unsigned 16-bit integer.
 
      ‘uint32’
           unsigned 32-bit integer.
 
      ‘uint64’
           unsigned 64-bit integer.
 
      The default for TYPE is ‘int32’.
 
      See also: intmin XREFintmin, flintmax XREFflintmax.
 
  -- : intmin (TYPE)
      Return the smallest integer that can be represented in an integer
      type.
 
      The variable TYPE can be
 
      ‘int8’
           signed 8-bit integer.
 
      ‘int16’
           signed 16-bit integer.
 
      ‘int32’
           signed 32-bit integer.
 
      ‘int64’
           signed 64-bit integer.
 
      ‘uint8’
           unsigned 8-bit integer.
 
      ‘uint16’
           unsigned 16-bit integer.
 
      ‘uint32’
           unsigned 32-bit integer.
 
      ‘uint64’
           unsigned 64-bit integer.
 
      The default for TYPE is ‘int32’.
 
      See also: intmax XREFintmax, flintmax XREFflintmax.
 
  -- : flintmax ()
  -- : flintmax ("double")
  -- : flintmax ("single")
      Return the largest integer that can be represented consecutively in
      a floating point value.
 
      The default class is "double", but "single" is a valid option.  On
      IEEE 754 compatible systems, ‘flintmax’ is 2^{53} for "double" and
      2^{24} for "single".
 
      See also: intmax XREFintmax, realmax XREFrealmax,
      realmin XREFrealmin.
octave: Integer Data Types

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