OPAL Numeric Functions

Numeric functions act on and/or produce numeric values, for your mathematical calculation needs.

Function	Description
abs	Returns the absolute value of ‘val’.
arccos_deg	Computes the arc cosine of the input.
arccos_rad	Computes the arc cosine of the input.
arcsin_deg	Computes the arc sine of the input.
arcsin_rad	Computes the arc sine of the input.
arctan_deg	Computes the arc tangent of the input.
arctan_rad	Computes the arc tangent of the input.
avg	Calculate the arithmetic average of the input expression across the group, or of the scalar arguments if more than one.
ceil	Returns ‘val’ rounded up to the given ‘precision’.
cos_deg	Computes the cosine of the input and returns a float64.
cos_rad	Computes the cosine of the input and returns a float64.
count	Count the number of non-null items in the group.
degrees	Converts from radians to degrees.
delta	Calculates the value difference of the argument in each time bin for each group.
delta_monotonic	Calculates the amount of difference in a column in each time bin for each group.
dense_rank	Returns the dense rank within an ordered group of values.
deriv	Calculate the average per-second derivative of the argument across the group.
exp	Returns Euler’s number e raised to the given number.
float64_null	Returns a null value of type float64.
floor	Returns ‘val’ rounded down to the given ‘precision’.
haversine_distance_km	Computes the great circle approximate distance between two latitude/longitude coordinates, using the haversine formula.
int64_null	Returns a null value of type int64.
int_div	Returns the integer quotient of the dividend divided by the divisor and truncates the remainder.
ln	Returns natural logarithm of a numeric expression.
log	Returns logarithm of a numeric expression (second argument) with the provided base (first argument).
median	Return the fast approximate median value of one column.
median_exact	Return the exact median value of one column.
mod	Returns the remainder when dividend is divided by the divisor.
percentile	Returns an approximated value for the specified percentile of the input expression across the group.
percentile_cont	Assuming a continuous distribution, return the value for the specified percentile of the input expression across the group.
percentile_disc	Assuming a discrete distribution, return the value for the specified percentile of the input expression across the group.
pi	Returns the value of pi as a float64.
pow	Returns a number ‘base’ raised to the specified power ‘exponent’.
prom_quantile	Calculates an approximate percentile value of the distribution in a histogram metric generated by a Prometheus data source.
radians	Converts from degrees to radians.
rank	Returns the rank within an ordered group of values.
rate	Calculate the average per-second rate of the argument across the group.
round	Returns ‘val’ rounded to the given ‘precision’.
row_number	Return the window index of the row within its groupby, when ordered by the orderby.
sin_deg	Computes the sine of the input and returns a float64.
sin_rad	Computes the sine of the input and returns a float64.
sqrt	Returns the square root for a given input and null if input is negative.
stddev	Calculate the standard deviation across the group.
sum	Calculate the sum of the argument across the group, or of the scalar arguments if more than one.
tan_deg	Computes the tangent of the input and returns a float64.
tan_rad	Computes the tangent of the input and returns a float64.
uniform	Generates a uniformly-distributed pseudo-random number in the inclusive range [min, max].
width_bucket	Construct equi-width histogram by dividing up the range between min and max with num_buckets buckets, and compute an integer
zipf	Returns a Zipf-distributed integer, for N elements and characteristic exponent s.