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