if.txt
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 IF IF statement condition.
    The general form of the IF statement is
 
       IF expression
         statements
       ELSEIF expression
         statements
       ELSE
         statements
       END
 
    The statements are executed if the real part of the expression 
    has all non-zero elements. The ELSE and ELSEIF parts are optional.
    Zero or more ELSEIF parts can be used as well as nested IF's.
    The expression is usually of the form expr rop expr where 
    rop is ==, <, >, <=, >=, or ~=.
 
    Example
       if I == J
         A(I,J) = 2;
       elseif abs(I-J) == 1
         A(I,J) = -1;
       else
         A(I,J) = 0;
       end
 
    See also RELOP, ELSE, ELSEIF, END, FOR, WHILE, SWITCH.

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