Replace np.single with np.float32 for consistancy

gprMax/geometry_outputs.py

@@ -410,10 +410,10 @@ class Metadata:
 
     def srcs_rx_gv_comment(
         self, srcs: Union[Sequence[Source], List[Rx]]
-    ) -> Tuple[List[str], npt.NDArray[np.single]]:
+    ) -> Tuple[List[str], npt.NDArray[np.float32]]:
         """Used to name sources and/or receivers."""
         names: List[str] = []
-        positions: npt.NDArray[np.single] = np.empty((len(srcs), 3))
+        positions: npt.NDArray[np.float32] = np.empty((len(srcs), 3))
         for index, src in enumerate(srcs):
             position = src.coord * self.grid.dl
             names.append(src.ID)
@@ -421,7 +421,7 @@ class Metadata:
 
         return names, positions
 
-    def dx_dy_dz_comment(self) -> npt.NDArray[np.single]:
+    def dx_dy_dz_comment(self) -> npt.NDArray[np.float32]:
         return self.grid.dl
 
     def nx_ny_nz_comment(self) -> npt.NDArray[np.intc]:

gprMax/grid/fdtd_grid.py

@@ -58,21 +58,21 @@ class FDTDGrid:
         self.nx = 0
         self.ny = 0
         self.nz = 0
-        self.dl = np.ones(3, dtype=np.single)
+        self.dl = np.ones(3, dtype=np.float32)
         self.dt = 0.0
 
         # Field Arrays
-        self.Ex: npt.NDArray[np.single]
-        self.Ey: npt.NDArray[np.single]
-        self.Ez: npt.NDArray[np.single]
-        self.Hx: npt.NDArray[np.single]
-        self.Hy: npt.NDArray[np.single]
-        self.Hz: npt.NDArray[np.single]
+        self.Ex: npt.NDArray[np.float32]
+        self.Ey: npt.NDArray[np.float32]
+        self.Ez: npt.NDArray[np.float32]
+        self.Hx: npt.NDArray[np.float32]
+        self.Hy: npt.NDArray[np.float32]
+        self.Hz: npt.NDArray[np.float32]
 
         # Dispersive Arrays
-        self.Tx: npt.NDArray[np.single]
-        self.Ty: npt.NDArray[np.single]
-        self.Tz: npt.NDArray[np.single]
+        self.Tx: npt.NDArray[np.float32]
+        self.Ty: npt.NDArray[np.float32]
+        self.Tz: npt.NDArray[np.float32]
 
         # Geometry Arrays
         self.solid: npt.NDArray[np.uint32]

gprMax/snapshots.py

@@ -110,7 +110,7 @@ class Snapshot:
         filename: str,
         fileext: str,
         outputs: Dict[str, bool],
-        grid_dl: npt.NDArray[np.single],
+        grid_dl: npt.NDArray[np.float32],
         grid_dt: float,
     ):
         """
@@ -358,7 +358,7 @@ class MPISnapshot(Snapshot):
         filename: str,
         fileext: str,
         outputs: Dict[str, bool],
-        grid_dl: npt.NDArray[np.single],
+        grid_dl: npt.NDArray[np.float32],
         grid_dt: float,
     ):
         super().__init__(

gprMax/vtkhdf_filehandlers/vtk_image_data.py

@@ -30,9 +30,9 @@ class VtkImageData(VtkHdfFile):
         self,
         filename: Union[str, PathLike],
         shape: npt.NDArray[np.intc],
-        origin: Optional[npt.NDArray[np.single]] = None,
-        spacing: Optional[npt.NDArray[np.single]] = None,
-        direction: Optional[npt.NDArray[np.single]] = None,
+        origin: Optional[npt.NDArray[np.float32]] = None,
+        spacing: Optional[npt.NDArray[np.float32]] = None,
+        direction: Optional[npt.NDArray[np.float32]] = None,
         comm: Optional[MPI.Comm] = None,
     ):
         """Create a new VtkImageData file.
@@ -77,15 +77,15 @@ class VtkImageData(VtkHdfFile):
         self._set_root_attribute(self.WHOLE_EXTENT_ATTR, whole_extent)
 
         if origin is None:
-            origin = np.zeros(self.DIMENSIONS, dtype=np.single)
+            origin = np.zeros(self.DIMENSIONS, dtype=np.float32)
         self.set_origin(origin)
 
         if spacing is None:
-            spacing = np.ones(self.DIMENSIONS, dtype=np.single)
+            spacing = np.ones(self.DIMENSIONS, dtype=np.float32)
         self.set_spacing(spacing)
 
         if direction is None:
-            direction = np.diag(np.ones(self.DIMENSIONS, dtype=np.single))
+            direction = np.diag(np.ones(self.DIMENSIONS, dtype=np.float32))
         self.set_direction(direction)
 
     @property
@@ -93,18 +93,18 @@ class VtkImageData(VtkHdfFile):
         return self._get_root_attribute(self.WHOLE_EXTENT_ATTR)
 
     @property
-    def origin(self) -> npt.NDArray[np.single]:
+    def origin(self) -> npt.NDArray[np.float32]:
         return self._get_root_attribute(self.ORIGIN_ATTR)
 
     @property
-    def spacing(self) -> npt.NDArray[np.single]:
+    def spacing(self) -> npt.NDArray[np.float32]:
         return self._get_root_attribute(self.SPACING_ATTR)
 
     @property
-    def direction(self) -> npt.NDArray[np.single]:
+    def direction(self) -> npt.NDArray[np.float32]:
         return self._get_root_attribute(self.DIRECTION_ATTR)
 
-    def set_origin(self, origin: npt.NDArray[np.single]):
+    def set_origin(self, origin: npt.NDArray[np.float32]):
         """Set the origin coordinate of the image data.
 
         Args:
@@ -114,7 +114,7 @@ class VtkImageData(VtkHdfFile):
             raise ValueError(f"Origin attribute must have {self.DIMENSIONS} dimensions.")
         self._set_root_attribute(self.ORIGIN_ATTR, origin)
 
-    def set_spacing(self, spacing: npt.NDArray[np.single]):
+    def set_spacing(self, spacing: npt.NDArray[np.float32]):
         """Set the discritisation of the image data.
 
         Args:
@@ -124,7 +124,7 @@ class VtkImageData(VtkHdfFile):
             raise ValueError(f"Spacing attribute must have {self.DIMENSIONS} dimensions.")
         self._set_root_attribute(self.SPACING_ATTR, spacing)
 
-    def set_direction(self, direction: npt.NDArray[np.single]):
+    def set_direction(self, direction: npt.NDArray[np.float32]):
         """Set the coordinate system of the image data.
 
         Args: