This command performs a conditional IF operation on two
real arguments. The possible operations are equal
(EQ), greater than (GT), less than (LT), greater or
equal (GE), less or equal (LE), and not equal
(NE). If the condition
is true, the command specified in the THEN variable
is executed. Otherwise the command in the ELSE
variable is executed. Typically, these commands are
GO_TO statements.