comma, ,

You can use commas or spaces to separate the row elements in an array. In practice, spaces are preferred but commas can be useful to visually separate longer expressions.

A = [2 4 6 8]

A = 1×4

     2     4     6     8

B = [1+1, 2+2, 3+3, 4+4]

B = 1×4

     2     4     6     8

Use commas to separate the subscripts in an indexing expression. Use a colon to select an entire array dimension.

A = [1 2 3; 4 5 6; 7 8 9]

A = 3×3

     1     2     3
     4     5     6
     7     8     9

A(1,2)

ans = 
2

A(2,:)

ans = 1×3

     4     5     6

Use commas to separate the input and output arguments in a function call.

A = magic(5);
[Y,I] = max(A,[],2)

Y = 5×1

    24
    23
    22
    21
    25

I = 5×1

     2
     1
     5
     4
     3

Use commas to separate multiple commands on the same line and show output. Alternatively, use semicolons to separate commands on the same line while suppressing output.

A = 2, B = 3, C = A*B

A = 
2

B = 
3

C = 
6