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三种数组是：数值型矩阵，字符数组（或字符串），单元数组（也有叫元胞数组）
1、数值型矩阵转换为字符数组（num2str、mat2str）
>> A=[1,2,3;4,5,6];
>> B=num2str(A)
B =
1 2 3
4 5 6
>> whos
Name
Size
Bytes
Class
Attributes
A
2x3
48
double
B
2x7
28 char
2、字符数组转换为数值型（str2num<4位精度>、str2double<双精度>）
>> B=['123.34'];
>> A=str2num(B)
A =
123.3400
>> whos
Name
Size
Bytes
Class
Attributes
A
1x1
8
double
B
1x6
12
char
3、单元数组转换为字符数组（cell2mat）：
例如：
>>
A={'sfjsdlgksdgjlsdjgkl'};
>> B=cell2mat(A)
B =
sfjsdlgksdgjlsdjgkl
>> whos
Name
Size
Bytes
Class
Attributes
A
1x1
98
cell
B
1x19
38
char
4、字符数组转换为单元数组(cellstr)
>>
A=['what';'edit';'play'];%注意：用A=[]生成字符数组是，必须保证每行有相同的长度，不够可用空格补
>> B=cellstr(A)
B =
'what'
'edit'
'play'
>> whos
Name
Size
Bytes
Class
Attributes
A
3x4
24
char
B
3x1
204
cell
5、单元数组转换为数值型矩阵
>> A={'123.4'};
>> B=cell2mat(A)
B =
123.4
>> C=str2num(B)
C =
123.4000
>> whos
Name
Size
Bytes
Class
Attributes
A
1x1
70
cell
B
1x5
10
char
C
1x1
8 double
6、数值型矩阵转换为单元数组(num2cell)
>> A=[1,2,3;4,5,6];
>> B=num2cell(A)
B =
[1]
[2] [3]
[4]
[5] [6]
>> whos
Name
Size
Bytes
Class
Attributes
A
2x3
48
double
B
2x3
408 cell
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