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Merged
mchav merged 2 commits into from
Jan 23, 2026
Merged

Build a sampleM for the monadic interface by wrapping DataFRame.Opera… #137

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Build a sampleM for the monadic interface by wrapping DataFRame.Opera…
amiri Jan 23, 2026
a74486e
Run scripts/format.sh and scripts/lint.sh --fix
amiri Jan 23, 2026
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4 changes: 4 additions & 0 deletions src/DataFrame/Monad.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ import DataFrame.Internal.Column (Columnable)
import DataFrame.Internal.Expression (Expr (..))

import qualified Data.Text as T
import System.Random

-- A re-implementation of the state monad.
-- `mtl` might be too heavy a dependency just to get
Expand Down Expand Up @@ -61,6 +62,9 @@ renameM expr newName = deriveM newName expr
filterWhereM :: Expr Bool -> FrameM ()
filterWhereM p = modifyM (D.filterWhere p)

sampleM :: (RandomGen g) => g -> Double -> FrameM ()
sampleM pureGen p = modifyM (D.sample pureGen p)

filterJustM :: (Columnable a) => Expr (Maybe a) -> FrameM (Expr a)
filterJustM (Col name) = FrameM $ \df ->
let df' = D.filterJust name df
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18 changes: 15 additions & 3 deletions src/DataFrame/Operations/Subset.hs
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Expand Up @@ -18,11 +18,23 @@ import qualified Prelude

import Control.Exception (throw)
import Data.Function ((&))
import Data.Maybe (fromJust, fromMaybe, isJust, isNothing)
import Data.Maybe (
fromJust,
fromMaybe,
isJust,
isNothing,
)
import Data.Type.Equality (TestEquality (..))
import DataFrame.Errors (DataFrameException (..), TypeErrorContext (..))
import DataFrame.Errors (
DataFrameException (..),
TypeErrorContext (..),
)
import DataFrame.Internal.Column
import DataFrame.Internal.DataFrame (DataFrame (..), empty, getColumn)
import DataFrame.Internal.DataFrame (
DataFrame (..),
empty,
getColumn,
)
import DataFrame.Internal.Expression
import DataFrame.Internal.Interpreter
import DataFrame.Operations.Core
Expand Down