This is a list of RPN operators known in RRD4. One can have more informations at the rrdtool help page.

They return 1 for true value, 0 otherwise.

• LE
• LT
• GE
• GT
• EQ
• NE
• IF
• UN: Return true if the popped element is NaN.
• ISINF: Return true if the popped element is infinite, as tested by Double.isInfinite.

The logical operators use the value of the stack as a logical value (0 being false). They return 0 as false and 1 as true.

• AND
• OR
• XOR

• MAX
• MIN
• MAXNAN
• MINNAN
• LIMIT

• ADDNAN, make a addition, ignoring NaN value
• /
• % (Modulus)
• SIN
• COS
• LOG
• SQRT
• ABS
• SIGN
• EXP
• POW
• ATAN
• ATAN2
• DEG2RAD
• RAD2DEG

Some rounding functions

• CEIL
• FLOOR
• ROUND

• PI: π
• E: e
• UNKN: Pushes an unknown (NaN) value on the stack.

• INF
• NEGINF
• PREV
• RANDOM: Return an random number between 0 and 1
• RND: Pop one element (count) from the stack. Return a random number between 0 and element – 1.
• STEP: return the time stop from the datasource.
• COUNT.

• NOW: Pushes the current time on the stack.
• TIME: Pushes the time the currently processed value was taken at onto the stack.
• LTIME.

The following functions pop one elements from the stack, it set a date using it as an epoch timein seconds and return the corresponding calendar field.

• YEAR
• MONTH, in the range [1,12]
• DATE: the day of month
• HOUR
• MINUTE
• SECOND
• WEEK: it should be used carefully as the returned value depends on the current time zone and current local

• DUP
• POP
• EXC

• SORT
• REV
• AVG
• TREND
• TREDNAN
• PREDICT
• PREDICTSIGMA