Safe Haskell	None
Language	Haskell2010

Frames.Melt

Synopsis

type family Elem t ts :: Bool where ...
type family Or (a :: Bool) (b :: Bool) :: Bool where ...
type family Not a :: Bool where ...
type family Disjoint ss ts :: Bool where ...
type ElemOf ts r = RElem r ts (RIndex r ts)
class RowToColumn ts rs where
- rowToColumnAux :: Proxy ts -> Rec f rs -> [CoRec f ts]
rowToColumn :: RowToColumn ts ts => Rec f ts -> [CoRec f ts]
meltAux :: forall vs ss ts. (vs ⊆ ts, ss ⊆ ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => Record ts -> [Record (("value" :-> CoRec ElField vs) ': ss)]
type family RDeleteAll ss ts where ...
meltRow' :: forall proxy vs ts ss. (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> Record ts -> [Record (("value" :-> CoRec ElField vs) ': ss)]
retroSnoc :: forall t ts. Record (t ': ts) -> Record (ts ++ '[t])
meltRow :: (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> Record ts -> [Record (ss ++ '["value" :-> CoRec ElField vs])]
class HasLength (ts :: [k]) where
- hasLength :: proxy ts -> Int
melt :: forall vs ts ss proxy. (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, HasLength vs, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> FrameRec ts -> FrameRec (ss ++ '["value" :-> CoRec ElField vs])

Documentation

type family Elem t ts :: Bool where ... Source #

Equations

Elem t '[] = False
Elem t (t ': ts) = True
Elem t (s ': ts) = Elem t ts

type family Or (a :: Bool) (b :: Bool) :: Bool where ... Source #

Equations

Or True b = True
Or a b = b

type family Not a :: Bool where ... Source #

Equations

Not True = False
Not False = True

type family Disjoint ss ts :: Bool where ... Source #

Equations

Disjoint '[] ts = True
Disjoint (s ': ss) ts = Or (Not (Elem s ts)) (Disjoint ss ts)

type ElemOf ts r = RElem r ts (RIndex r ts) Source #

class RowToColumn ts rs where Source #

Methods

rowToColumnAux :: Proxy ts -> Rec f rs -> [CoRec f ts] Source #

Instances

RowToColumn (ts :: [k]) ([] :: [k]) Source #
Instance details Defined in Frames.Melt Methods rowToColumnAux :: Proxy ts -> Rec f [] -> [CoRec f ts] Source #
(r ∈ ts, RowToColumn ts rs) => RowToColumn (ts :: [a]) (r ': rs :: [a]) Source #
Instance details Defined in Frames.Melt Methods rowToColumnAux :: Proxy ts -> Rec f (r ': rs) -> [CoRec f ts] Source #

rowToColumn :: RowToColumn ts ts => Rec f ts -> [CoRec f ts] Source #

Transform a record into a list of its fields, retaining proof that each field is part of the whole.

meltAux :: forall vs ss ts. (vs ⊆ ts, ss ⊆ ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => Record ts -> [Record (("value" :-> CoRec ElField vs) ': ss)] Source #

type family RDeleteAll ss ts where ... Source #

Equations

RDeleteAll '[] ts = ts
RDeleteAll (s ': ss) ts = RDeleteAll ss (RDelete s ts)

meltRow' :: forall proxy vs ts ss. (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> Record ts -> [Record (("value" :-> CoRec ElField vs) ': ss)] Source #

This is melt, but the variables are at the front of the record, which reads a bit odd.

retroSnoc :: forall t ts. Record (t ': ts) -> Record (ts ++ '[t]) Source #

Turn a cons into a snoc after the fact.

meltRow :: (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> Record ts -> [Record (ss ++ '["value" :-> CoRec ElField vs])] Source #

Like melt in the reshape2 package for the R language. It stacks multiple columns into a single column over multiple rows. Takes a specification of the id columns that remain unchanged. The remaining columns will be stacked.

Suppose we have a record, r :: Record [Name,Age,Weight]. If we apply melt [pr1|Name|] r, we get two values with type Record [Name, "value" :-> CoRec Identity [Age,Weight]]. The first will contain Age in the value column, and the second will contain Weight in the value column.

class HasLength (ts :: [k]) where Source #

Methods

hasLength :: proxy ts -> Int Source #

Instances

HasLength ([] :: [k]) Source #
Instance details Defined in Frames.Melt Methods hasLength :: proxy [] -> Int Source #
HasLength ts => HasLength (t ': ts :: [k]) Source #
Instance details Defined in Frames.Melt Methods hasLength :: proxy (t ': ts) -> Int Source #

melt :: forall vs ts ss proxy. (vs ⊆ ts, ss ⊆ ts, vs ~ RDeleteAll ss ts, HasLength vs, Disjoint ss ts ~ True, ts ≅ (vs ++ ss), ColumnHeaders vs, RowToColumn vs vs) => proxy ss -> FrameRec ts -> FrameRec (ss ++ '["value" :-> CoRec ElField vs]) Source #

Applies meltRow to each row of a FrameRec.