VirtualFloatColumn

class getml.data.columns.VirtualFloatColumn(df_name, operator, operand1, operand2)

Handle to a (lazily evaluated) virtual float column.

Virtual columns do not actually exist - they will be lazily evaluated when necessary.

Methods

abs()	Compute absolute value.
acos()	Compute arc cosine.
as_str()	Transforms column to a string.
asin()	Compute arc sine.
assert_equal([alias])	ASSERT EQUAL aggregation.
atan()	Compute arc tangent.
avg([alias])	AVG aggregation.
cbrt()	Compute cube root.
ceil()	Round up value.
cos()	Compute cosine.
count([alias])	COUNT aggregation.
day()	Extract day (of the month) from a time stamp.
erf()	Compute error function.
exp()	Compute exponential function.
floor()	Round down value.
gamma()	Compute gamma function.
hour()	Extract hour (of the day) from a time stamp.
is_inf()	Determine whether the value is infinite.
is_nan()	Determine whether the value is nan.
is_null()	Determine whether the value is nan.
lgamma()	Compute log-gamma function.
log()	Compute natural logarithm.
max([alias])	MAX aggregation.
median([alias])	MEDIAN aggregation.
min([alias])	MIN aggregation.
minute()	Extract minute (of the hour) from a time stamp.
month()	Extract month from a time stamp.
round()	Round to nearest.
second()	Extract second (of the minute) from a time stamp.
sin()	Compute sine.
sqrt()	Compute square root.
stddev([alias])	STDDEV aggregation.
sum([alias])	SUM aggregation.
tan()	Compute tangent.
to_numpy([sock])	Transform column to numpy array
update(condition, values)	Returns an updated version of this column.
var([alias])	VAR aggregation.
weekday()	Extract day of the week from a time stamp, Sunday being 0.
year()	Extract year from a time stamp.
yearday()	Extract day of the year from a time stamp.

Attributes

length

The length of the column (number of rows in the data frame).