BUG: Fix plot_objective() error on 32-bit OS

Fixes #3

Author: kernc

sambo/_sceua.py

@@ -51,10 +51,10 @@ def _evolve_complex(func, args, population, func_values, complex_indices, bounds
             complex_population[worst_idx] = contraction
             complex_values[worst_idx] = contraction_value
         else:
-            # Replace worst with random point
-            x = _sample_population(bounds, 1, constraints, rng)
-            complex_population[worst_idx:] = x
-            complex_values[worst_idx:] = np.apply_along_axis(func, 1, x, *args)
+            n_worst = len(complex_indices) - 2  # This includes our +1 at index 0
+            x = _sample_population(bounds, n_worst, constraints, rng)
+            complex_population[-n_worst:] = x
+            complex_values[-n_worst:] = np.apply_along_axis(func, 1, x, *args)
 
     sorted_indices = np.argsort(complex_values)
     complex_population = complex_population[sorted_indices]

sambo/plot.py

@@ -414,7 +414,7 @@ def _check_plot_dims(plot_dims, bounds) -> list[int]:
         plot_dims = np.where(bounds[:, 0] != bounds[:, 1])[0]
         if not plot_dims.size:
             raise ValueError(f'All dimensions are constant: {bounds[:, 0].tolist()}')
-    plot_dims = np.unique(plot_dims).astype(int, casting='safe')
+    plot_dims = np.unique(plot_dims).astype(np.int_, casting='safe')
     return plot_dims.tolist()