MATLAB——元胞数组
一、
1、元胞数组的创建
>> a={'matlab',20;ones(2,3),1:10}
a =
'matlab' [ 20]
[2x3 double] [1x10 double]>> a={'matlab',20;ones(2,3),1:10}
>> b=[{'matlab'},{20};{ones(2,3)},{1:10}]
b =
'matlab' [ 20]
[2x3 double] [1x10 double]
a和b是等价的
>> c={10}
c =
[10]
>> c(2,2)={5}
c =
[10] []
[] [5]
>> c(1,2)={2}
c =
[10] [2]
[] [5]
clear all
a={'matlab',20;ones(2,3),1:10}
b=[{'matlab'},{20};{ones(2,3)},{1:10}]
c={10}
c(1,2)={2}
c(2,2)={5}
c(2,1)=3
赋值需用花括号，下标用小括号。
>> isequal(a,b)
ans =
1
>> whos
Name Size Bytes Class Attributes
a 2x2 596 cell
ans 1x1 1 logical
b 2x2 596 cell
c 2x2 480 cell
>> d=cell(3,3)
d =
[] [] []
[] [] []
[] [] []
2、元胞数组访问
>> str=a(1,1)
str =
'matlab'
>> class(str)
ans =
cell
>> str=a{1,1}
str =
matlab
>> class(str)
ans =
char
>> a{2,2}
ans =
1 2 3 4 5 6 7 8 9 10
>> a(2,2)
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(2,2)(2)
错误: ()-索引必须显示在索引表达式的最后。
>> a{2,2}(2)
ans =
2
>> b=c{2:3,2:3}
b =
5
>> b=c(2:3,2:3)
b =
[5] [6]
[8] [9]
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(2,:)
d =
[2x3 double] [1x10 double]
>> d=a(2,2)
d =
[1x10 double]
>> d=a{2,2}
d =
1 2 3 4 5 6 7 8 9 10
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={20,'matlab';ones(2,3),1:3}
a =
[ 20] 'matlab'
[2x3 double] [1x3 double]
>> a(2)
ans =
[2x3 double]
>> a(3)
ans =
'matlab'
可以看出四个元胞数组的排序
>> a{4}=[]
a =
[ 20] 'matlab'
[2x3 double] []
>> a(4)=[]
a =
[20] [2x3 double] 'matlab'
删除一个之后的重新排序。
