trace -package:base is:exact -package:base-prelude

Compute the trace of a matrix

>>> trace (V2 (V2 a b) (V2 c d))
a + d

trace :: ComonadTraced m w => m -> w a -> a

comonad Control.Comonad.Traced Control.Comonad.Traced.Class

trace :: Comonad w => m -> TracedT m w a -> a

comonad Control.Comonad.Trans.Traced

trace :: PandocMonad m => Text -> m ()

pandoc Text.Pandoc.Class

Output a debug message to sterr, using trace, if tracing is enabled. Note: this writes to stderr even in pure instances.

trace :: Int -> IOStateArrow s b String -> IOStateArrow s b b

hxt Text.XML.HXT.Arrow.XmlState Text.XML.HXT.Arrow.XmlState.TraceHandling

apply a trace arrow and issue message to stderr

trace :: Print b => b -> a -> a

protolude Protolude.Debug

Warning: trace remains in code

trace :: String -> a -> a

relude Relude.Debug

Warning: trace remains in code

trace :: forall (v :: Type -> Type) n m b . (Metric v, OrderedField n, Semigroup m) => Lens' (QDiagram b v n m) (Trace v n)

diagrams-lib Diagrams.Trace

Lens onto the Trace of a QDiagram.

trace :: forall r_aAb6 . Member Trace r_aAb6 => String -> Sem r_aAb6 ()

polysemy Polysemy.Trace

Log a message.

trace :: Text -> a -> a

rio RIO

Warning: Trace statement left in code

trace :: Text -> Sh ()

shelly Shelly

Internally log what occurred. Log will be re-played on failure.

trace :: MonadSh m => Text -> m ()

shelly Shelly.Lifted

trace :: Text -> Sh ()

shelly Shelly.Pipe

see trace

trace :: Num a => Matrix a -> a

matrix Data.Matrix

Sum of the elements in the diagonal. See also getDiag. Example:

( 1 2 3 )
( 4 5 6 )
trace ( 7 8 9 ) = 15

trace :: CanTrace x m => proxy x -> String -> m ()

reflex Reflex.Spider.Internal

trace :: String -> a -> a

classy-prelude ClassyPrelude

Warning: Leaving traces in the code

trace :: (Metric v, OrderedField n, Semigroup m) => Lens' (QDiagram b v n m) (Trace v n)

diagrams-core Diagrams.Core Diagrams.Core.Types

Lens onto the Trace of a QDiagram.

trace :: (IsStream t, MonadAsync m) => (a -> m b) -> t m a -> t m a

streamly Streamly.Internal.Data.Stream.IsStream Streamly.Prelude

Apply a monadic function to each element flowing through the stream and discard the results.

>>> Stream.drain $ Stream.trace print (Stream.enumerateFromTo 1 2)
1
2

Compare with tap.

trace :: String -> a -> a

Cabal-syntax Distribution.Compat.Prelude

Deprecated: Don't leave me in the code

trace :: HasTrace s a => Lens' s a

openapi3 Data.OpenApi.Lens

trace :: forall (sig :: (Type -> Type) -> Type -> Type) m . Has Trace sig m => String -> m ()

fused-effects Control.Effect.Trace

Append a message to the trace log.

trace :: Text -> a -> a

universum Universum.Debug

Warning: trace remains in code

trace :: Monad m => (a -> m b) -> Stream m a -> Stream m a

streamly-core Streamly.Data.Stream

Apply a monadic function to each element flowing through the stream and discard the results.

>>> s = Stream.enumerateFromTo 1 2

>>> Stream.fold Fold.drain $ Stream.trace print s
1
2

Compare with tap.