From e878adc45ce77cf5d088036a3988bfea909baf1c Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Wed, 10 May 2023 10:14:48 +0200
Subject: Adding a new TransitionProbabilityMatrix.py file.

---
 .../GazeAnalysis/TransitionProbabilityMatrix.py    | 32 ++++++++++++++++++++++
 src/argaze/GazeAnalysis/__init__.py                |  2 +-
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 src/argaze/GazeAnalysis/TransitionProbabilityMatrix.py

diff --git a/src/argaze/GazeAnalysis/TransitionProbabilityMatrix.py b/src/argaze/GazeAnalysis/TransitionProbabilityMatrix.py
new file mode 100644
index 0000000..e27265d
--- /dev/null
+++ b/src/argaze/GazeAnalysis/TransitionProbabilityMatrix.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+from typing import TypeVar, Tuple, Any
+from dataclasses import dataclass, field
+import math
+
+from argaze import GazeFeatures
+
+import pandas
+
+@dataclass
+class VisualScanAnalyzer(GazeFeatures.VisualScanAnalyzer):
+    """Implementation of transition probability matrix algorithm as described in ...
+    """
+
+    def __post_init__(self):
+
+        pass
+
+    def analyze(self, visual_scan: GazeFeatures.VisualScanType) -> Any:
+        """Analyze visual scan."""
+
+        assert(len(visual_scan) > 1)
+
+        sequence = []
+
+        for step in visual_scan:
+
+            sequence.append(step.aoi)
+
+        return pandas.crosstab(pandas.Series(sequence[1:], name='to'), pandas.Series(sequence[:-1], name='from'), normalize=1)
+
diff --git a/src/argaze/GazeAnalysis/__init__.py b/src/argaze/GazeAnalysis/__init__.py
index 4643641..2e66274 100644
--- a/src/argaze/GazeAnalysis/__init__.py
+++ b/src/argaze/GazeAnalysis/__init__.py
@@ -2,4 +2,4 @@
 .. include:: README.md
 """
 __docformat__ = "restructuredtext"
-__all__ = ['DispersionBasedGazeMovementIdentifier']
\ No newline at end of file
+__all__ = ['DispersionBasedGazeMovementIdentifier', 'TransitionProbabilityMatrix']
\ No newline at end of file
-- 
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