Octave - no syntax error

GNU Octave, version 4.0.3
Copyright (C) 2016 John W. Eaton and others.
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>> a = magic(5)
a =

   17   24    1    8   15
   23    5    7   14   16
    4    6   13   20   22
   10   12   19   21    3
   11   18   25    2    9

>> k=a,3
k =

   17   24    1    8   15
   23    5    7   14   16
    4    6   13   20   22
   10   12   19   21    3
   11   18   25    2    9

ans =  3
>>