Resolve #8: added exhaustive list of random processes from chapter 3.

pyproject.toml

@@ -34,7 +34,8 @@ select = ["E",
           "PL",
           "NPY",
           "PERF",
-          "C90"]
+          "C90",
+          "RUF"]
 ignore = ["D213", "D401", "D211"]
 
 [tool.ruff.lint.pydocstyle]

pyssp/system.py

@@ -1,20 +1,57 @@
 """Chapter 3, stochastic systems."""
 
 
+import random
 from collections.abc import Generator
 from typing import NoReturn
 
 
-def arma(p: int, q: int, process: None | Generator = None) -> NoReturn:
+class RandomProcess(random.Random):
+    """Random process base class."""
+
+
+def arma(p: int, q: int, N: int, process: None | Generator = None) -> NoReturn:
     """Auto-regressive Moving-Average."""
     raise NotImplementedError()
 
 
-def ar(p: int, process: None | Generator = None) -> NoReturn:
+def ar(p: int, N: int, process: None | Generator = None) -> NoReturn:
     """Auto-regressive."""
     raise NotImplementedError()
 
 
-def ma(q: int, process: None | Generator = None) -> NoReturn:
-    """Moving Average."""
+def ma(q: int, N: int, process: None | Generator = None) -> NoReturn:
+    """Moving Average Random (stochastic) process."""
+    raise NotImplementedError()
+
+
+def harmonic(A: int, process: None | Generator = None) -> NoReturn:
+    """The harmonic random process."""
+    raise NotImplementedError()
+
+
+def white_noise(variance: float) -> NoReturn:
+    """The harmonic random process.
+    Page 93.
+
+    """
+    raise NotImplementedError()
+
+
+def white_gaussian_noise() -> NoReturn:
+    """A random process consisting of a sequence of uncorrelated real-valued Gaussian random
+    variables.
+
+    Page 94.
+
+    """
+    raise NotImplementedError()
+
+
+def bernoulli() -> NoReturn:
+    """The Bernoulli process consists of a sequence of uncorrelated Bernoulli variables (-1, 1).
+
+    Page 94.
+
+    """
     raise NotImplementedError()