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2.18 Join 2 matrices side-by-side and on top of each others

Mathematica

In Mathematica, to join 2 matrices side-by-side, use Join with '2' as the third argument. To join them one on top of the other, use '1' as the third argument 

a = RandomInteger[10, {3, 3}]
 


Out[146]= {{8,5, 1}, 
           {8,10,8}, 
           {6,0, 8}}
 


b = RandomInteger[10, {3, 3}]
 


 {{9, 0,1}, 
 {10,2,7}, 
 {8, 0,8}}
 


(*join side-by-side as in Matlab [A B]*) 
Join[a, b, 2]
 


 {{8,5, 1, 9,0,1}, 
 {8,10,8,10,2,7}, 
 {6,0, 8, 8,0,8}}
 


(*join vertically as in Matlab [A;B]*) 
Join[a, b, 1]
 


 {{8, 5 , 1}, 
 {8, 10, 8}, 
 {6, 0 , 8}, 
 {9, 0 , 1}, 
 {10,2 , 7}, 
 {8, 0 , 8}}

 

Matlab 

A=rand(3,3) 
B=rand(3,3) 
[A B]
 


 0.5472 0.2575 0.8143 0.3500 0.6160 0.8308 
 0.1386 0.8407 0.2435 0.1966 0.4733 0.5853 
 0.1493 0.2543 0.9293 0.2511 0.3517 0.5497
 


[A;B]
 


    0.5472    0.2575    0.8143 
    0.1386    0.8407    0.2435 
    0.1493    0.2543    0.9293 
    0.3500    0.6160    0.8308 
    0.1966    0.4733    0.5853 
    0.2511    0.3517    0.5497

 

Maple 

A:=ArrayTools:-RandomArray(3,3,distribution = uniform); 
B:=ArrayTools:-RandomArray(3,3,distribution = uniform); 
<A|B>;   #side by side 
 
<A,B>;  #on top of each others 
 
#or 
Matrix([A,B]); #side by side 
Matrix([[A],[B]]); #on top of each others

 

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