R Under development (unstable) (2023-08-09 r84924 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(stars))
> tif = system.file("tif/L7_ETMs.tif", package = "stars")
> x = read_stars(tif)
> (xx = x[,c(1:347,349),c(1:350,352),]) # rectilinear: one-but-last row & col missing
stars object with 3 dimensions and 1 attribute
attribute(s):
             Min. 1st Qu. Median    Mean 3rd Qu. Max.
L7_ETMs.tif     1      54     69 68.9915      86  255
dimension(s):
     from  to                     refsys point
x       1 348 SIRGAS 2000 / UTM zone 25S FALSE
y       1 351 SIRGAS 2000 / UTM zone 25S FALSE
band    1   6                         NA    NA
                                      values x/y
x    [288790.5,288819),...,[298708.5,298737) [x]
y    [9120747,9120718),...,[9110743,9110715) [y]
band                                    NULL    
> image(xx) # chooses useRaster itself
>   # see also tidy.R for a ggplot example, leaving out the row.
> 
> m = matrix(1:16, 4, 4)
> x = 1:4
> y = 2:5
> (st = st_as_stars(list(m = m), dimensions = st_dimensions(x = x, y = y)))
stars object with 2 dimensions and 1 attribute
attribute(s):
   Min. 1st Qu. Median Mean 3rd Qu. Max.
m     1    4.75    8.5  8.5   12.25   16
dimension(s):
  from to offset delta point x/y
x    1  4      1     1 FALSE [x]
y    1  4      2     1 FALSE [y]
> st = st_set_dimensions(st, 1, values = c(1,2,3,4,6))
> st = st_set_dimensions(st, 2, values = c(2,3,4,5,8))
> try(st_set_dimensions(st, 2, values = c(2,3,4,5,8,20))) # one too many
Error in st_set_dimensions(st, 2, values = c(2, 3, 4, 5, 8, 20)) : 
  length of values ( 6 ) does not match length of dimension 2 ( 4 )
> 
> # $<-.stars:
> st$foo = st$m * 2
> st
stars object with 2 dimensions and 2 attributes
attribute(s):
     Min. 1st Qu. Median Mean 3rd Qu. Max.
m       1    4.75    8.5  8.5   12.25   16
foo     2    9.50   17.0 17.0   24.50   32
dimension(s):
  from to point          values x/y
x    1  4 FALSE [1,2),...,[4,6) [x]
y    1  4 FALSE [2,3),...,[5,8) [y]
> 
> # st_as_sf:
> 
> if (utils::packageVersion("sf") > "0.7.2") {
+ 	plot(st_as_sf(st, as_points = FALSE), axes = TRUE)
+ }
> 
> image(st, text_values = TRUE, axes = TRUE)
> 
> proc.time()
   user  system elapsed 
   1.43    0.17    1.61