Fix #22

Author: ufechner7

CHANGELOG.md

@@ -2,6 +2,7 @@
 #### Changed
 - do not print OK when calling plot any longer
 - document the use of the fig parameter with the function plot2d
+- the single-argument `plot(Y)` now uses `eachindex(Y)` instead of `1:length(Y)` for better generality with custom-indexed arrays
 
 ### ControlPlots.jl v0.2.9 2025-08-21
 #### Added

src/plot.jl

@@ -184,7 +184,7 @@ function plot(X, Y1::AbstractVector{<:Number}, Y2::AbstractVector{<:Number};
 end
 
 function plot(Y::AbstractVector{<:Number}; xlabel="", ylabel="", title="", fig="", ysize=14, disp=false)
-    X = 1:length(Y)
+    X = collect(eachindex(Y))
     plot(X, Y; xlabel, ylabel, title, fig, disp, ysize)
 end