matlabint32和char,MATLAB数据类型
MATLAB数据类型
亲吻的图片MATLAB中的基本数据类型(也称为类)是数组或矩阵。 MATLAB中有15种基本数据类型。这些数据类型中的每⼀个都在矩阵或数组的内部。此矩阵或数组的⼤⼩最⼩为0 x 0，并且可以增加为任意⼤⼩的n维数组。
下表描述了这些数据类型是：
Data Type
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Description
int8, uint8,
int16, uint16,
int32, uint32,
int64, uint64
uint16(65000)
The array of signed and unsigned integers. It requires less storage space than single or double. All integer data types except for int64 and uint64 can be ud in mathematical operations.
single
3 * 10^38
The array of single-precision numbers. It requires less storage space than double but has less precision and a smaller range.
double
3 * 10^300
5 + 6i
logical
梦想实现家
magic(4) > 10
Array of logical value of 1 or 0 to reprent true and fal respectively. Two-dimensional arrays can be spar.
char
‘Hello’
Array of characters. Strings are reprented as vectors of characters. For arrays including more than one string, it is good to u cell arrays.
cell array
a{1,1} = 12;
a{1,2} = ‘Red’;
a{1,3} = magic(4);
Array of indexed cells, each capable of saving an array of a various dimension and data type.
structure
a.day = 12;
a.mat = magic(3);
Array of C-like structures, each structure having named fields capable of storing an array of a different dimension and data type.
function handle
@sin
Pointer to a function. You can pass function handles to other functions.
ur class
polynom([0 -2 -5])
Objects constructed from a ur-defined class.
Java class
java.awt.Frame
Objects constructed from a Java class.
数值类型
MATLAB中的数值数据类型包含有符号和⽆符号整数，以及单精度和双精度浮点数。整数和单精度数组⽐双精度数组提供了更⾼的内存效率存储。
所有数字类型都提供基本的数组功能，例如下标和整形。除int64和uint64之外的所有数字类型都可以在数字运算中使⽤。
整数
MATLAB具有四个有符号和四个⽆符号整数数据类型。
带符号的类型既可以使⽤负数也可以使⽤正数，但是不能执⾏与⽆符号类型相同的数字范围，因为使⽤⼀位来指定该数字的正号或负号。
MATLAB提供了数字数据的1、2、4和8字节存储。如果使⽤容纳您数据的最⼩整数类型，则可以节省程序的内存和执⾏时间。例如，我们不需要32位整数来保存值100。中庸的意思
这是⼋个数字数据类型，每种类型可以保存的值范围，以及创建该类型所需的MATLAB转换操作：
反腐倡廉建设Data Type
Range of Values
Conversion Function
Signed 8-bit integer
-27 to 27-1
int8
Signed 16-bit integer
-215 to 215-1
int16
Signed 32-bit integer
-231 to 231-1
int32
Signed 64-bit integer
-
263 to 263-1
int64
Unsigned 8-bit integer
0 to 28-1
uint8
Unsigned 16-bit integer
0 to 216-1
uint16
Unsigned 32-bit integer
0 to 232-1
uint32
Unsigned 64-bit integer
0 to 264-1
uint64
创建整数数据
MATLAB默认将数字数据保存为双精度浮点数。要将数据保存为整数，请使⽤上表中所⽰的转换函数之⼀：
我们可以使⽤whos函数显⽰变量表⽰的数组的维数，字节数和数据类型：
如果只想验证x是整数，请使⽤isinteger函数：
整数函数
Function
Description汽车保险排名
int8, int16,
int32, int64
It convert to signed 1-, 2-, 4-, or 8-byte integer.
uint8, uint16,
uint32, uint64
It converts to unsigned 1-, 2-, 4-, or 8-byte integer.
class
It returns the data type of an object.
isa
It determines if the input value has the specified data type.
isinteger
It determines if input value is an integer array.
isnumeric
It determines if the input value is a numeric array.
浮点数字
MATLAB以双精度或单精度格式显⽰浮点数。默认值为双精度，但是我们可以使⽤简单的转换函数使任意数量的单精度。
双精度浮点
MATLAB根据IEEE标准754编写了double数据类型，以实现双精度。存储为双重需要的64位的任何值，其格式如下表所⽰：Bits
Usage
63
Sign (0 = positive, 1 = negative)
62 to 52
Exponent, biad by 1023
51 to 0
Fraction f of the number 1.f
单精度浮点
MATLAB会根据IEEE标准754编写单⼀精度的单⼀数据类型。保存为单个值的任何值都需要32位，格式如下表所⽰：
Bits
31
Sign (0 = positive, 1 = negative)
30 to 23
Exponent, biad by 127
22 to 0
Fraction f of the number 1.f
浮点函数
Function
Description
double
It converts to double precision.
single
It converts to single precision.
class
It returns the data type of an object.
isa
It determines if the input value has the specified data type.
isfloat
It determines if the input value is a floating-point array.
isnumeric
It determines if the input value is a numeric array
eps
It returns the floating-point relative accuracy. This value is the tolerance MATLAB us in its evaluation. realmax
It returns the largest floating-point number your computer can reprent.
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realmin
It returns the smallest floating-point number our computer can reprent.
葱爆羊肉的家常做法复数
复数由两个独⽴的部分组成：实部和虚部。初级虚数单位等于-1的平⽅根。这在MATLAB中以两个字母之⼀显⽰：i或j。创建复数
以下语句显⽰了⼀种在MATLAB中创建复杂值的⽅法。变量x被分配了⼀个复数，其实部为2，虚部为3：
x = 2 + 3i;
复数函数
