Include @bvandenbroucke's typo corrections in dimension.h as well as the...

Include @bvandenbroucke's typo corrections in dimension.h as well as the sphere to radius calculation functions.

src/dimension.h

@@ -39,23 +39,26 @@
 
 #define hydro_dimension 3.f
 #define hydro_dimension_inv 0.3333333333f
-#define hydro_dimention_unit_sphere ((float)(4. * M_PI / 3.))
+#define hydro_dimension_unit_sphere ((float)(4. * M_PI / 3.))
+#define hydro_dimension_unit_sphere_inv ((float)(3. * M_1_PI / 4.))
 
 #elif defined(HYDRO_DIMENSION_2D)
 
 #define hydro_dimension 2.f
 #define hydro_dimension_inv 0.5f
-#define hydro_dimention_unit_sphere ((float)M_PI)
+#define hydro_dimension_unit_sphere ((float)M_PI)
+#define hydro_dimension_unit_sphere_inv ((float)M_1_PI)
 
 #elif defined(HYDRO_DIMENSION_1D)
 
 #define hydro_dimension 1.f
 #define hydro_dimension_inv 1.f
-#define hydro_dimention_unit_sphere 2.f
+#define hydro_dimension_unit_sphere 2.f
+#define hydro_dimension_unit_sphere_inv 0.5f
 
 #else
 
-#error "A problem dimensionality must be chosen in const.h !"
+#error "A problem dimensionality must be chosen in config.h !"
 
 #endif
 
@@ -201,6 +204,35 @@ invert_dimension_by_dimension_matrix(float A[3][3]) {
 #endif
 }
 
+/**
+ * @brief Get the radius of a dimension sphere with the given volume
+ *
+ * @param volume Volume of the dimension sphere
+ * @return Radius of the dimension sphere
+ */
+__attribute__((always_inline)) INLINE static float get_radius_dimension_sphere(
+    float volume) {
+
+#if defined(HYDRO_DIMENSION_3D)
+
+  return cbrtf(volume * hydro_dimension_unit_sphere_inv);
+
+#elif defined(HYDRO_DIMENSION_2D)
+
+  return sqrtf(volume * hydro_dimension_unit_sphere_inv);
+
+#elif defined(HYDRO_DIMENSION_1D)
+
+  return volume * hydro_dimension_unit_sphere_inv;
+
+#else
+
+  error("The dimension is not defined !");
+  return 0.f;
+  
+#endif
+}
+
 /* ------------------------------------------------------------------------- */
 #ifdef WITH_VECTORIZATION
 

src/kernel_hydro.h

@@ -230,7 +230,7 @@ static const float kernel_coeffs[(kernel_degree + 1) * (kernel_ivals + 1)]
    kernel_gamma_inv_dim)
 
 /* Kernel normalisation constant (volume term) */
-#define kernel_norm ((float)(hydro_dimention_unit_sphere * kernel_gamma_dim))
+#define kernel_norm ((float)(hydro_dimension_unit_sphere * kernel_gamma_dim))
 
 /* ------------------------------------------------------------------------- */