added the nargin < 1 print_usage check to barh that had been previously added to bar, pushed as:
http://hg.savannah.gnu.org/hgweb/octave/rev/e3ae86170488

and added and expanded set of BISTS for bar and barh, pushed as:
http://hg.savannah.gnu.org/hgweb/octave/rev/f5b433492c16

adding the tests pointed out a few other issues, currently as xfail BISTs.  will look to see if any of those are easy fixes and then will push the fix to `__bar__.m` for horizontal / baseline issues.

Also note that bug #65734 was added to capture some specific issues with axis limits/labels not being updated properly with changes to bar plots.

working patch attached that seems to fix both the vertical baseline and stacked bar issue mentioned in comment #1.  This patch adds 'horizontal' bargroup property checks when needed flip appropriate x/y related items tied to baseline and related listeners. 

both it and bar needs actual tests (for this and base functionality), but demo bar and demo barh look good now. (without the patch the barh demo baseline issues are apparent, probably should have noticed when first fixing stacked and adding that demo.) 

I think i have the listeners right, some check the baseline where x  and y are plot x and y, others check bargroup data where xdata is always the position/categorical data and y is always the bar length for both vertical and horizontal graphs.  I tried manually set()'ing a number of different features and couldn't break it, but could use some others more familiar with these objects to test out things i may not have thought of.

in the meantime i'll try to generate some plot-property/value checks to implement tests for bar/barh. 

(built against default. might not be bad to push against stable to fix the broken horizontal stacked bar issue from comment #1. if not will probably split BISTs into a patch against stable.)

My first thought was that this was going to be related to the "BaseValue" property.  I seem to remember it was troublesome to implement.

Adding to my my comments. It looks to me that "baseline" (and "basevalue") is always refers to canonical X and Y axes.

And that also explain messed up "stacked"
example. Here is another test. Try the following code with and without specifying "basevalue":

y = [8 15 33; 30 35 40; 50 55 62];
barh(y,'BaseValue',35)

Dmitri.
--

attached comparison images from octave 9.1 and matlab 2024a using the comment #0 script without the printing.  matlab keeps a vertical base bar while octave appears to keep the horizontal bar. that would be fine for bar but not barh.

Confirm. Not sure what would matlab do in that case, does it plot
a vertical line at 0?

I noticed some other issues with brh(). E.g.:

x = [1980 1990 2000];
y = [15 20 -5; 10 -17 21; -10 5 15];
barh(x,y,'stacked')

looks all messed up, but perhaps it should be a different bug report.

Dmitri.
--