(,) comma; instruction, argument separator
Commas are used to separate parameters in functions, to separate entries of a row vector or to separate entries of a row of matrix .
Blanks can also be used to separate entries in a row vector but use preferably commas.
Commas are also used to separate Scilab instructions. (Use ; to have the result not displayed on the screen).
a=[1,2,3;4,5,6];
b=1,c=1;d=2