feat(numpy_frontends): implement real_if_close function.

ivy/functional/frontends/numpy/mathematical_functions/miscellaneous.py

@@ -359,4 +359,17 @@ def nan_to_num(x, copy=True, nan=0.0, posinf=None, neginf=None):
 
 @to_ivy_arrays_and_back
 def real_if_close(a, tol=100):
-    return ivy.array(a)  # ivy doesn't yet support complex numbers
+    a = ivy.array(a, dtype=a.dtype)
+    dtype_ = a.dtype
+
+    if not ivy.is_complex_dtype(dtype_):
+        return a
+
+    if tol > 1:
+        f = ivy.finfo(dtype_)
+        tol = f.eps * tol
+
+    if ivy.all(ivy.abs(ivy.imag(a)) < tol):
+        a = ivy.real(a)
+
+    return a

ivy_tests/test_ivy/test_frontends/test_numpy/test_mathematical_functions/test_miscellaneous.py

@@ -585,11 +585,17 @@ def test_numpy_nan_to_num(
 # real_if_close
 @handle_frontend_test(
     fn_tree="numpy.real_if_close",
-    dtype_and_x=helpers.dtype_and_values(available_dtypes=helpers.get_dtypes("float")),
+    dtype_and_x=helpers.dtype_and_values(
+        available_dtypes=helpers.get_dtypes("float_and_complex"),
+        min_dim_size=1,
+        min_num_dims=1,
+    ).filter(lambda x: "bfloat16" not in x[0]),
+    tol=st.integers(min_value=1, max_value=1000),
     test_with_out=st.just(False),
 )
 def test_numpy_real_if_close(
     dtype_and_x,
+    tol,
     frontend,
     test_flags,
     fn_tree,
@@ -605,6 +611,7 @@ def test_numpy_real_if_close(
         fn_tree=fn_tree,
         on_device=on_device,
         a=x[0],
+        tol=tol,
     )