initialize on step = 0

Author: ejmeitz

src/loggers.jl

@@ -996,6 +996,12 @@ Base.values(dl::DisplacementLogger) = dl.displacements
 
 function log_property!(dl::DisplacementLogger, s::System, neighbors=nothing,
                         step_n::Integer=0; kwargs...)
+
+    # Initialize the logger at step 0
+    if step_n == 0
+        dl.last_coords = copy(s.coords)
+        dl.last_displacements = zero(s.coords)
+    end
 
     if (step_n % dl.n_update) == 0
         dl.last_displacements .+= vector.(dl.last_coords, s.coords, s.boundary)