Mention transformation must be strictly monotonic

tidyverse · Feb 28, 2024 · f5acd7c · f5acd7c
1 parent bc3e401
commit f5acd7c
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Showing 3 changed files with 6 additions and 4 deletions.
diff --git a/R/axis-secondary.R b/R/axis-secondary.R
@@ -4,7 +4,7 @@
 #' secondary axis, positioned opposite of the primary axis. All secondary
 #' axes must be based on a one-to-one transformation of the primary axes.
 #'
-#' @param transform A formula or function of transformation
+#' @param transform A formula or function of a strictly monotonic transformation
 #'
 #' @param trans `r lifecycle::badge("deprecated")`
 #'
@@ -205,7 +205,9 @@ AxisSecondary <- ggproto("AxisSecondary", NULL,
 
     # Test for monotonicity
     if (!is_unique(sign(diff(full_range))))
-      cli::cli_abort("Transformation for secondary axes must be monotonic.")
+      cli::cli_abort(
+        "Transformation for secondary axes must be strictly monotonic."
+      )
   },
 
   break_info = function(self, range, scale) {

diff --git a/man/sec_axis.Rd b/man/sec_axis.Rd
diff --git a/tests/testthat/_snaps/sec-axis.md b/tests/testthat/_snaps/sec-axis.md
@@ -8,5 +8,5 @@
 
 ---
 
-    Transformation for secondary axes must be monotonic.
+    Transformation for secondary axes must be strictly monotonic.