MATH(DOCS)              The Optical Printer Control System      MATH(DOCS)

    NAME
        math - math expressions in OPCS

    MATH EXPRESSIONS    
        You can usually use math expressions in place of most numeric 
        arguments as long as the expression is ENCLOSED IN PARENTHESIS,
        and DOES NOT CONTAIN EMBEDDED SPACES. Example:

            (3+(3*sqrt(16)*12))

        Math can be done on frame counter values:

            (cam+3)

        For a complete list of all built in math operations, execute:

             (?)

        The following lists some of the operations supported by the 
        math expression parser:

             /*** TYPICAL OPERATIONS ***/

             (3+4-2*12/6)       # add, subtract, multiply, divide
             (533%256)          # modulus
             (2^4)              # exponentiation (powers)

             /*** OPCS VALUES ***/
             cam   - camera counter value
             pro   - main projector counter value
             pro1  - main projector counter value 
             pro2  - aerial projector counter value

             /*** MATH FUNCTIONS ***/

             sqrt(),  log(),     exp(),
             sin(),   cos(),     tan(),
             asin(),  acos(),    atan(),
             atan2(), radians(), degrees()
             hex(), pi

             /*** NUMERIC EXPRESSIONS ***/
             -12           # negative 12
             +34           # positive 34
             0x3ff         # hex representation for 1023 decimal

    THE ONLINE CALCULATOR
        To aid the operator, the above techniques can be used for printing 
        the answer to expressions by typing them alone on a line surrounded
        by parenthesis.

        Example:

           (3+(3*sqrt(16)*12)) 

        ..on a blank line (as if it were a command), the answer will be 
        printed to the screen:

           147.000000 

        Camera, and both Aerial and Main Projector frame counters can
        all be refereced in math expressions by their command names.

        For instance, to send the Aerial Projector (pro2) to the same
        frame as the Main Projector's (pro) current frame counter plus
        5 frames:
            
            pro2 >(pro+5)

        ..so if the Main Projector's frame counter is 1000, the
	Aerial Projector will move to frame 1005.

        Or to sync both projectors to camera's current frame counter:

            seek >(cam) >(cam) 0
                 ------ ------ ------
                 Aerial Main   Camera

        ..so if the camera counter is 210, this will send both
        aerial and main projectors to frame 210 as well.

    BUGS
        Needs logicals some day, like 'not()', 'xor()', 'and()', etc.

    ORIGIN
        Gregory Ercolano, Los Feliz California 12/15/89