Problem using {tinytable} with colnames <- NULL

General
1

I am running into what appears to be a minor conflict between {data.table} and {tinytable}. I simply wanted a single column data.table with no column name. The base command colnames(DT1) <- NULL gives me the data.table that I want but tt(DT1) throws an error.

Can anyone duplicate this or is it some peculiarity specific to my system?
Thanks.

# Load packages -----------------------------------------------------------
library(data.table)
library(tinytable)

# Load data ---------------------------------------------------------------
dat1 <-structure(list(EU = c("Austria", "Belgium", "Bulgaria", "Croatia", 
"Cyprus", "Czech Republic", "Denmark", "Estonia", "Finland", 
"France", "Germany", "Greece", "Hungary", "Ireland", 
"Italy", 
"Latvia", "Lithuania", "Luxembourg", "Malta", "Netherlands", 
"Poland", "Portugal", "Romania", "Slovakia", "Slovenia", "Spain", 
"Sweden")), class = "data.frame", row.names = c(NA, -27L)) 

DT1 <- as.data.table(dat1)

# Create {titytable} table from data.frame sans  column name -----------------------------
colnames(dat1) <- NULL
tt(dat1)


# Create {tinytable} table from data.table sans  column name -----------------
colnames(DT1) <- NULL
tt(DT1)

> sessionInfo()
R version 4.5.0 (2025-04-11)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 24.04.2 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.12.0 
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.12.0  LAPACK version 3.12.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C               LC_TIME=en_US.UTF-8       
 [4] LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                  LC_ADDRESS=C              
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

time zone: America/Toronto
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] tinytable_0.8.0   data.table_1.17.0

loaded via a namespace (and not attached):
[1] compiler_4.5.0    litedown_0.7      tools_4.5.0       rstudioapi_0.17.1 fansi_1.0.6      
[6] knitr_1.50        xfun_0.52         evaluate_1.0.3
2

I can replicate the error.

3

Ah, thank you.I can pass it on to the author of {tinytables}. It seems like a weird glitch since

DT2 <- as.data.table(dat1)
setnames(DT2, "EU", "European Union")
tt(DT2)

works with no problem.

4

Thanks, this should be fixed in version 0.9.0.9 on Github. The fix will be part of the next release on CRAN.

For reference, the issue seems to be upstream:

library(data.table)
x <- data.table(mtcars)
colnames(x) <- NULL
as.data.frame(x)
#> Error in setalloccol(y): Internal error in alloccol: length of names (0) is not length of dt (11). Please report to the data.table issues tracker.
5

Should I register the problem with the {data.table} people?