From 919743c3548e19db372235c311e14096efbcdf06 Mon Sep 17 00:00:00 2001
From: Milan Bouchet-Valat <nalimilan@club.fr>
Date: Fri, 27 Dec 2024 23:27:20 +0100
Subject: [PATCH] Fix error message

---
 src/extras.jl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/extras.jl b/src/extras.jl
index b15c7e5c..355d8284 100644
--- a/src/extras.jl
+++ b/src/extras.jl
@@ -258,9 +258,9 @@ function cut(x::AbstractArray, ngroups::Integer;
     min_x, max_x = extrema(xnm)
     breaks = [min_x; breaks; max_x]
     if !allowempty && !allunique(@view breaks[1:end-1])
-        n = length(unique(breaks))
+        n = length(unique(breaks)) - 1
         throw(ArgumentError("cannot compute $ngroups quantiles: `quantile` " *
-                            "returned only $n group(s) due to duplicated values in `x`." *
+                            "returned only $n group(s) due to duplicated values in `x`. " *
                             "Pass `allowempty=true` to allow empty quantiles or " *
                             "choose a lower value for `ngroups`."))
     end