fix: Typo in gravitational energy

9b17f30
(#152) introduced a bug in
the gravitational energy.
The arguments of E_gravity_density are reversed.  This doesn't show up in
tests because the psi used is real, so the incorrect energy density can
be coerced to be real.

Fix this and update the tests of summaries so that psi is complex.

Author: musoke

Project.toml

@@ -1,7 +1,7 @@
 name = "UltraDark"
 uuid = "1c8d022d-dfc0-4b41-80ab-3fc7e88cdfea"
 authors = ["Nathan Musoke <n.musoke@auckland.ac.nz>"]
-version = "0.9.4"
+version = "0.9.5"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"

src/grids.jl

@@ -467,7 +467,7 @@ end
 
 Gravitational energy density of field `psi` in gravitational potential `Phi`
 """
-function E_gravity_density(psi::Number, Phi::Number)
+function E_gravity_density(psi::Number, Phi::Real)::Real
     Phi .* abs2.(psi) / 2.0
 end
 
@@ -478,7 +478,7 @@ end
 Gravitational potential energy
 """
 function E_grav(grids, psi)
-    Folds.mapreduce(E_gravity_density, +, grids.Φx, psi) * dV(grids)
+    Folds.mapreduce(E_gravity_density, +, psi, grids.Φx) * dV(grids)
 end
 
 function E_grav(grids::AbstractGrids)

test/summary.jl

@@ -28,7 +28,7 @@ pencilgrids = PencilGrids(1.0, 8)
 external_states = ()
 
 for g in [grids, pencilgrids]
-    g.ψx .= 1.0
+    g.ψx .= 1.0 + im
     @. g.ρx = abs2(g.ψx)
 end