docs: adding documentation of benchmark

README.md

@@ -37,5 +37,11 @@ uv pip install -e .
 import mega.op.function as function
 
 number: float = 5.2
-print(function.gamma(number))
+gamma_function = mega.GammaZ(number)
+print(gamma_function.compute())
 ```
+
+## benchmark information
+
+**Sigma Function**
+![sigma_z_benchmark](test/sigma_z_benchmark_vertical.png)

mega/op/arithmethic.pyx

@@ -114,7 +114,7 @@ cdef class SigmaZ:
         """
         Return string representation of the object
         """
-        return f"SigmaZ({self.n}, {self.z}) = {SigmaZ(self.n, self.z).compute()}"
+        return f"SigmaZ({self.n}, {self.z})"
 
 cdef class EulerPhi:
     """
@@ -238,3 +238,5 @@ cdef class EulerPhi:
 
     def __repr__(self):
         return f"EulerPhi({self.n})"
+
+

pyproject.toml

@@ -11,6 +11,12 @@ dependencies = [
     "cython>=3.1.0",
     "numpy>=2.2.6",
     "pre-commit>=4.2.0",
-    "pytest>=8.3.5",
     "setuptools>=80.7.1",
 ]
+
+[dependency-groups]
+dev = [
+    "black>=25.1.0",
+    "matplotlib>=3.10.3",
+    "pytest>=8.3.5",
+]