fix: issue with nan in elementwise sum

When aggregating rates we want nan to be treated as zero, if not the nan
spreads and we consider emissions for installation as nan when only one
consumer isn't defined.

Refs: equinor/ecalc-internal#1436

Author: jsolaas

src/libecalc/common/list/list_utils.py

@@ -62,26 +62,22 @@ def group_data_by_value_at_index(index: int, row_based_data: list[list[Any]]) ->
     return chart_grouped_by_index
 
 
-def elementwise_sum(*vectors: Sequence[float], periods: Periods | None = None) -> NDArray[np.float64]:
+def elementwise_sum(*vectors: Sequence[float]) -> NDArray[np.float64]:
     """Sum up multiple vectors elementwise.
 
     E.g. if we provide three lists [1,20], [2,10], [1,30], the result will be [1+2+1,20+10+30] = [4,60]
 
     Args:
         *vectors: Sequences to be summed up elementwise
-        periods: Optional list of periods used to initialize resulting array. If no periods are provided, the first vector is used
 
     Returns:
         Numpy array where the elements of provided vectors are summed up elementwise
 
     """
-    if periods is not None:
-        result = np.full_like(periods.periods, fill_value=0.0, dtype=float64)
-    else:
-        result = np.full_like(vectors[0], fill_value=0.0, dtype=float64)
+    result = np.full_like(vectors[0], fill_value=0.0, dtype=float64)
 
     for vector in vectors:
-        result = np.add(result, vector)
+        result = np.add(np.nan_to_num(result), np.nan_to_num(vector))
     return result
 
 

tests/libecalc/integration/snapshots/test_all_energy_usage_models/test_all_results/all_energy_usage_models_v3.json

@@ -61786,7 +61786,7 @@
                     8.1339491,
                     8.1339491,
                     8.1339491,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -62039,7 +62039,7 @@
                     7.8380292,
                     7.8380292,
                     7.8380292,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -62292,7 +62292,7 @@
                     8.1339491,
                     8.1339491,
                     8.1339491,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -62545,7 +62545,7 @@
                     0.0,
                     0.0,
                     0.0,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -63140,7 +63140,7 @@
                     1.606285,
                     1.606285,
                     1.606285,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -63393,7 +63393,7 @@
                     1.6746959,
                     1.6746959,
                     1.6746959,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -63646,7 +63646,7 @@
                     12.606054,
                     12.606054,
                     12.606054,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -63899,7 +63899,7 @@
                     1.5061887,
                     1.5061887,
                     1.5061887,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -64241,7 +64241,7 @@
                     5.8009138,
                     5.8009138,
                     5.8009138,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -64494,7 +64494,7 @@
                     58.852375,
                     58.852375,
                     58.852375,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null
@@ -64747,7 +64747,7 @@
                     6.8173224,
                     6.8173224,
                     6.8173224,
-                    NaN
+                    0.0
                 ]
             },
             "streams": null