From e9837ee6da0111d7703d4131313d6ff52557cf90 Mon Sep 17 00:00:00 2001
From: Fredrik Bagge Carlson <baggepinnen@gmail.com>
Date: Sat, 14 Nov 2020 09:57:49 +0100
Subject: [PATCH] Update promotion (#394)

Solves the issue with `stepplot` in #378
---
 src/timeresp.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/timeresp.jl b/src/timeresp.jl
index 8a07cfc96..4799a65ec 100644
--- a/src/timeresp.jl
+++ b/src/timeresp.jl
@@ -165,7 +165,7 @@ function lsim(sys::AbstractStateSpace, u::Function, t::AbstractVector;
     elseif !(u0 isa Number && nu == 1) && (size(u0) != (nu,) && size(u0) != (nu,1))
         error("return value of u must be of size nu")
     end
-    T = promote_type(Float64, eltype(x0))
+    T = promote_type(Float64, eltype(x0), numeric_type(sys))
 
     dt = T(t[2] - t[1])