stan-dev/posterior

[FR?] rvar works in data.frame but not data.table

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#234 opened on Apr 5, 2022

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Description

Not sure if this is a posterior issue or data.table issue but it looks like you cannot put rvars into data.table but it does work with data.frame

library(data.table)
library(posterior)
n <- 4   # length of output vector
x_rvar <- rvar(array(rnorm(4000*n, mean = 1, sd = 1), dim = c(4000, n)))
x_rvar
# rvar<4000>[4] mean ± sd:
#   [1] 0.98 ± 1.00  1.00 ± 1.02  1.00 ± 0.99  0.99 ± 0.99 
# does not work :(
ex_dt = data.table(ex = x_rvar)
ex_dt
# Empty data.table (0 rows and 1 cols): ex
# does work
ex_df = data.frame(ex = x_rvar)
ex_df
# ex
# 1 0.9778591 ± 1.0010389
# 2 1.0015836 ± 1.0206705
# 3 0.9964342 ± 0.9948071
# 4 0.9947569 ± 0.9921549

Contributor guide

Research direction
Investigate how rvar objects are handled in data.table versus data.frame. Focus on the internal storage and access methods. Check if data.table's list column operations fail for rvar objects and consider implementing appropriate methods.
Tech stack
r
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
R
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75