From 424772c7bb85b3135539ea20c1bced6af982dd87 Mon Sep 17 00:00:00 2001
From: Daniel_Doehring <daniel.doehring@rwth-aachen.de>
Date: Thu, 23 Nov 2023 13:57:23 +0100
Subject: [PATCH] Make error norm calculation optional

---
 src/callbacks_step/analysis.jl | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/callbacks_step/analysis.jl b/src/callbacks_step/analysis.jl
index e5b4a01a885..46012def62d 100644
--- a/src/callbacks_step/analysis.jl
+++ b/src/callbacks_step/analysis.jl
@@ -377,8 +377,14 @@ function (analysis_callback::AnalysisCallback)(io, du, u, u_ode, t, semi)
         println()
     end
 
-    # Calculate L2/Linf errors, which are also returned
-    l2_error, linf_error = calc_error_norms(u_ode, t, analyzer, semi, cache_analysis)
+    if :l2_error in analysis_errors || :linf_error in analysis_errors
+        # Calculate L2/Linf errors, which are also returned
+        l2_error, linf_error = calc_error_norms(u_ode, t, analyzer, semi,
+                                                cache_analysis)
+    else # Need something to be returned
+        l2_error = nothing
+        linf_error = nothing
+    end
 
     if mpi_isroot()
         # L2 error