MATLAB——元胞数组

一、

1、元胞数组的创建

>>  a={'matlab',;ones(,),:}

a = 

    'matlab'        [         ]
    [2x3 double]    [1x10 double]>>  a={'matlab',;ones(,),:}

>>  b=[{'matlab'},{};{ones(,)},{:}]

b = 

    'matlab'        [         ]
    [2x3 double]    [1x10 double]

a和b是等价的

>>  c={}
c =
    []

>> c(2,2)={5}

c =

[10] []
[] [5]

>> c(1,2)={2}

c =

[10] [2]
[] [5]

clear all

a={'matlab',;ones(,),:}
b=[{'matlab'},{};{ones(,)},{:}]
c={}
c(,)={}
c(,)={}
c(,)=

赋值需用花括号，下标用小括号。

>> isequal(a,b)

ans =

>> whos
  Name      Size            Bytes  Class      Attributes

  a         2x2                 cell
  ans       1x1                   logical
  b         2x2                 cell
  c         2x2                 cell        

>> d=cell(,)

d = 

    []    []    []
    []    []    []
    []    []    []

2、元胞数组访问

>> str=a(,)

str = 

    'matlab'

>> class(str)

ans =

cell

>> str=a{,}

str =

matlab

>> class(str)

ans =

char

>> a{,}

ans =

>> a(,)

ans = 

    [1x10 double]

（）和{}有着本质的区别，大括号用于表示元胞的内容，小括号表示指定的元胞。

>> a(,)()
错误: ()-索引必须显示在索引表达式的最后。

>> a{,}()

ans =

>> b=c{:,:}

b =

>> b=c(:,:)

b = 

    []    []
    []    []

b相当于从c中获取了四个元胞，用a的例子更好理解

>> d=a(,:)

d = 

    [2x3 double]    [1x10 double]

>> d=a(,)

d = 

    [1x10 double]

>> d=a{,}

d =

3、元胞数组的删除和重塑

要删除单元数组中的行或列，可以用冒号表示单元数组中的行或列，然后对其赋一个空矩阵即可。

>> a={20,'matlab';ones(2,3),1:3}

a = 

    [        20]    'matlab'
    [2x3 double]    [1x3 double]

>> a{1,2}=[]

a =

[ 20] []
[2x3 double] [1x3 double]

>> a{1,1}=[]

a =

[] []
[2x3 double] [1x3 double]

>> a={,'matlab';ones(,),:}

a = 

    [        ]    'matlab'
    [2x3 double]    [1x3 double]

>> a()

ans = 

    [2x3 double]

>> a()

ans = 

    'matlab'

可以看出四个元胞数组的排序

>> a{}=[]

a = 

    [        ]    'matlab'
    [2x3 double]          []

>> a()=[]

a = 

    []    [2x3 double]    'matlab'

删除一个之后的重新排序。