MATLAB数据类型
MATLAB 并不需要任何类型的声明或维度报表。 MATLAB 每当遇到一个新的变量名称,创建变量,并分配适当的内存空间。
如果变量已经存在,则MATLAB替换以新的内容的原始内容,并分配新的存储空间,在必要的情况下。
例如,
Total = 42
上述语句创建了一个名为“Total” 的 1-1 矩阵存储值42。
MATLAB中可用的数据类型
MATLAB 提供15个基本数据类型。每种数据类型的数据存储在矩阵或阵列的形式。这个矩阵的大小或阵列是一个最低 0-0,这可以长大为任何规模大小的矩阵或数组。
下表显示了在 MATLAB 中最常用的数据类型:
数据类型 | 描述 |
---|---|
int8 | 8-bit signed integer |
uint8 | 8-bit unsigned integer |
int16 | 16-bit signed integer |
uint16 | 16-bit unsigned integer |
int32 | 32-bit signed integer |
uint32 | 32-bit unsigned integer |
int64 | 64-bit signed integer |
uint64 | 64-bit unsigned integer |
single | single precision numerical data |
double | double precision numerical data |
logical | logical values of 1 or 0, represent true and false respectively |
char | character data (strings are stored as vector of characters) |
cell array | array of indexed cells, each capable of storing an array of a different dimension and data type |
structure | C-like structures, each structure having named fields capable of storing an array of a different dimension and data type |
function handle | yiibaier to a function |
user classes | objects constructed from a user-defined class |
java classes | objects constructed from a Java class |
例子
创建一个脚本文件,用下面的代码:
str = 'Hello World!' n = 2345 d = double(n) un = uint32(789.50) rn = 5678.92347 c = int32(rn)
上面的代码编译和执行时,它会产生以下结果:
str = Hello World! n = 2345 d = 2345 un = 790 rn = 5.6789e+03 c = 5679
数据类型转换
MATLAB 提供各种函数,用于从一种数据类型转换到另一种。下表显示的数据类型转换函数:
函数 | 目的/作用 |
---|---|
char | Convert to character array (string) |
int2str | Convert integer data to string |
mat2str | Convert matrix to string |
num2str | Convert number to string |
str2double | Convert string to double-precision value |
str2num | Convert string to number |
native2unicode | Convert numeric bytes to Unicode characters |
unicode2native | Convert Unicode characters to numeric bytes |
base2dec | Convert base N number string to decimal number |
bin2dec | Convert binary number string to decimal number |
dec2base | Convert decimal to base N number in string |
dec2bin | Convert decimal to binary number in string |
dec2hex | Convert decimal to hexadecimal number in string |
hex2dec | Convert hexadecimal number string to decimal number |
hex2num | Convert hexadecimal number string to double-precision number |
num2hex | Convert singles and doubles to IEEE hexadecimal strings |
cell2mat | Convert cell array to numeric array |
cell2struct | Convert cell array to structure array |
cellstr | Create cell array of strings from character array |
mat2cell | Convert array to cell array with potentially different sized cells |
num2cell | Convert array to cell array with consistently sized cells |
struct2cell | Convert structure to cell array |
测定的数据类型
MATLAB 提供各种函数标识数据类型的变量。
下表提供了确定一个变量的数据类型的函数:
函数 | 目的/作用 |
---|---|
is | Detect state |
isa | Determine if input is object of specified class |
iscell | Determine whether input is cell array |
iscellstr | Determine whether input is cell array of strings |
ischar | Determine whether item is character array |
isfield | Determine whether input is structure array field |
isfloat | Determine if input is floating-yiibai array |
ishghandle | True for Handle Graphics object handles |
isinteger | Determine if input is integer array |
isjava | Determine if input is Java object |
islogical | Determine if input is logical array |
isnumeric | Determine if input is numeric array |
isobject | Determine if input is MATLAB object |
isreal | Check if input is real array |
isscalar | Determine whether input is scalar |
isstr | Determine whether input is character array |
isstruct | Determine whether input is structure array |
isvector | Determine whether input is vector |
class | Determine class of object |
validateattributes | Check validity of array |
whos | List variables in workspace, with sizes and types |
例子
创建一个脚本文件,用下面的代码:
-
x =
3
-
isinteger(x)
-
isfloat(x)
-
isvector(x)
-
isscalar(x)
-
isnumeric(x)
-
-
x =
23.54
-
isinteger(x)
-
isfloat(x)
-
isvector(x)
-
isscalar(x)
-
isnumeric(x)
-
-
x = [
1
2
3]
-
isinteger(x)
-
isfloat(x)
-
isvector(x)
-
isscalar(x)
-
-
x =
'Hello'
-
isinteger(x)
-
isfloat(x)
-
isvector(x)
-
isscalar(x)
-
isnumeric(x)
-
当运行该文件,它会产生以下结果:
-
-
x =
-
3
-
ans =
-
0
-
ans =
-
1
-
ans =
-
1
-
ans =
-
1
-
ans =
-
1
-
x =
-
23.5400
-
ans =
-
0
-
ans =
-
1
-
ans =
-
1
-
ans =
-
1
-
ans =
-
1
-
x =
-
1
2
3
-
ans =
-
0
-
ans =
-
1
-
ans =
-
1
-
ans =
-
0
-
x =
-
Hello
-
ans =
-
0
-
ans =
-
0
-
ans =
-
1
-
ans =
-
0
-
ans =
-
0
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Poseidon__ming:为什么每一次耗时这么长!!!!
Poseidon__ming:大水题啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊!!!!!!!!!!!!!!!!!!!!!!!!!
Poseidon__ming:大水题
Poseidon__ming:大水题
Poseidon__ming:大水题