例6- 46  矩陣的擴充。
>> A1=zeros(2,4)
A1 =
     0     0     0     0
     0     0     0     0
>> A2=ones(2)
A2 =
     1     1
     1     1
>> A3=ones(1,2)
A3 =
     1     1
>> A4=zeros(1,2)
A4 =
     0     0
>> A=[A1; A3 A4]
A =
     0     0     0     0
     0     0     0     0
     1     1     0     0
>> A=[A1;A2,A3,A4]
??? Error using ==> horzcat
All matrices on a row in the bracketed expression must have the 
 same number of rows.
??? Error using ==> edit
Can't edit the built-in function 'horzcat'.

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