search for: obj_hash

...on the fly without any > serialization, similarly to how identical works, but I am not aware of > any existing implementation We have one in vctrs but it's not exported: https://github.com/r-lib/vctrs/blob/main/src/hash.c The main use is vectorised hashing: ``` # Non-vectorised vctrs:::obj_hash(1:10) #> [1] 1e 77 ce 48 # Vectorised vctrs:::vec_hash(1L) #> [1] 70 a2 85 ef vctrs:::vec_hash(1:2) #> [1] 70 a2 85 ef bf 3c 2c cf # vctrs semantics so dfs are vectors of rows length(vctrs:::vec_hash(mtcars)) / 4 #> [1] 32 nrow(mtcars) #> [1] 32 ``` Best, Lionel On Wed, Jan 17, 2...

...t functions that come into my mind. Both are widely used, but they use serialize. The author of `digest` said: > > > "As you know, digest takes and (ahem) "digests" what serialize gives it, so you would have to look into what serialize lets you do." > > vctrs:::obj_hash is probably the closest to the implementation of `identical`, but the above examples give different results for identical objects. > > The existence of digest:: digest and rlang::hash shows that there is a huge demand for this "ideal" hash function. However, I bet most people are u...

On 1/16/24 20:16, Dipterix Wang wrote: > Could you recommend any packages/functions that compute hash such that > the source references and sexpinfo_struct are ignored? Basically a > version of `serialize` that convert R objects to raw without storing > the ancillary source reference and sexpinfo. > I think most people would think of `digest` but that package uses >