Filter Assigns a value to a variable. Logical expression results cannot be assigned to non logical variables, and vice versa. If no value is assigned to the Variable, the user will be prompted for the variable value.
Operations are vectorial, i.e. a full array is computed at the same time.
See SIC command. If neither of these options is present, the LET command works in the usual way. Standard input can be used, and pressing button GO will define all the variables as specified.