Next: Bit Manipulations, Previous: Single Precision Data Types, Up: Numeric Data Types [Contents][Index]
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.
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, ischar, islogical, isstring, isnumeric, isa.
Convert x to 8-bit integer type.
See also: uint8, int16, uint16, int32, uint32, int64, uint64.
Convert x to unsigned 8-bit integer type.
See also: int8, int16, uint16, int32, uint32, int64, uint64.
Convert x to 16-bit integer type.
See also: int8, uint8, uint16, int32, uint32, int64, uint64.
Convert x to unsigned 16-bit integer type.
Convert x to 32-bit integer type.
See also: int8, uint8, int16, uint16, uint32, int64, uint64.
Convert x to unsigned 32-bit integer type.
Convert x to 64-bit integer type.
See also: int8, uint8, int16, uint16, int32, uint32, uint64.
Convert x to unsigned 64-bit integer 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
.
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
.
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"
.
• Integer Arithmetic: |
Next: Bit Manipulations, Previous: Single Precision Data Types, Up: Numeric Data Types [Contents][Index]