Enter matrix A & B -> Add_Sub_Multiply

//Enter matrix a & b..
//It wiill get Added,Subtracted,Multiplied as given condition gets satisfied..
//For all the condition to get satisfied enter matrix of order 3*3..

a=input("Enter matrix a:")
b=input("Enter matrix b:")
[m1 n1]=size(a)
[m2 n2]=size(b)
if size(a)==size(b) then
    disp(a+b,"Addition of matrix:")
    disp(a-b,"Subtraction of matrix:")
else
disp("Addition,Subtraction not possible:")
end
if n1==m2 then
    disp(a*b,"Multiplication is:")
else
    disp("Multiplication not possible:")
end

Output
-->exec('D:\Scilab prog by me\prac3.sce', -1)
Enter matrix a:[1 2 3;4 5 6]
Enter matrix b:[4 5 6;7 8 9;10 11 12]

 Addition,Subtraction not possible:  

 Multiplication is:  

    48.     54.     60.  
    111.    126.    141.

-->exec('D:\Scilab prog by me\prac3.sce', -1)
Enter matrix a:[1 2 3;4 5 6]
Enter matrix b:[4 5 6;7 8 9]

 Addition of matrix:  

    5.     7.     9.  
    11.    13.    15.

 Subtraction of matrix:  

  - 3.  - 3.  - 3.
  - 3.  - 3.  - 3.

 Multiplication not possible:  

-->exec('D:\Scilab prog by me\prac3.sce', -1)
Enter matrix a:[1 2 3;4 5 6;7 8 9]
Enter matrix b:[11 12 13;14 15 16;17 18 19]

 Addition of matrix:  

    12.    14.    16.
    18.    20.    22.
    24.    26.    28.

 Subtraction of matrix:  

  - 10.  - 10.  - 10.
  - 10.  - 10.  - 10.
  - 10.  - 10.  - 10.

 Multiplication is:  

    90.     96.     102.
    216.    231.    246.
    342.    366.    390.