From ac61026d961ae5b8f0c3fbfc8f4aa424054a9963 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Sun, 5 Apr 2026 23:14:00 +0530
Subject: [PATCH 1/8] nuygvuy

---
 matrix.py      | 0
 test_matrix.py | 0
 2 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 matrix.py
 create mode 100644 test_matrix.py

diff --git a/matrix.py b/matrix.py
new file mode 100644
index 0000000..e69de29
diff --git a/test_matrix.py b/test_matrix.py
new file mode 100644
index 0000000..e69de29

From 282d6ada220ec37cadfee4f31abc4470ca96dbae Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:13:26 +0530
Subject: [PATCH 2/8] Added  matrix addition with rows and cols

---
 matrix.py      | 31 +++++++++++++++++++++++++++++++
 test_matrix.py |  4 ++++
 2 files changed, 35 insertions(+)

diff --git a/matrix.py b/matrix.py
index e69de29..e5d63c4 100644
--- a/matrix.py
+++ b/matrix.py
@@ -0,0 +1,31 @@
+def parse_matrix(mat_str):
+    import ast
+    return ast.literal_eval(mat_str)
+
+def add_matrix(a, b): pass
+
+def matrix_add(self, A, B):
+    A = self.parse_matrix(A)
+    B = self.parse_matrix(B)
+
+    if not A or not B:
+        raise ValueError("Empty matrix")
+
+    rows = len(A)
+    cols = len(A[0])
+
+    if rows != len(B) or cols != len(B[0]):
+        raise ValueError("Matrix dimensions must match")
+
+    result = []
+    for i in range(rows):
+        row = []
+        for j in range(cols):
+            row.append(A[i][j] + B[i][j])
+        result.append(row)
+
+    return str(result)
+
+def subtract_matrix(a, b): pass
+def multiply_matrix(a, b): pass
+def transpose_matrix(a): pass
diff --git a/test_matrix.py b/test_matrix.py
index e69de29..e3e3cc1 100644
--- a/test_matrix.py
+++ b/test_matrix.py
@@ -0,0 +1,4 @@
+def test_add():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_add('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[6, 8], [10, 12]]'
\ No newline at end of file

From bc2f1f3f31e614d1434340a63bafd8d986029d78 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:35:30 +0530
Subject: [PATCH 3/8] Added matrix multiplication

---
 matrix.py      | 30 ++++++++++++++++++++++++++++--
 test_matrix.py |  7 ++++++-
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/matrix.py b/matrix.py
index e5d63c4..88db64c 100644
--- a/matrix.py
+++ b/matrix.py
@@ -2,8 +2,6 @@ def parse_matrix(mat_str):
     import ast
     return ast.literal_eval(mat_str)
 
-def add_matrix(a, b): pass
-
 def matrix_add(self, A, B):
     A = self.parse_matrix(A)
     B = self.parse_matrix(B)
@@ -28,4 +26,32 @@ def matrix_add(self, A, B):
 
 def subtract_matrix(a, b): pass
 def multiply_matrix(a, b): pass
+
+def matrix_multiply(self, A, B):
+    A = self.parse_matrix(A)
+    B = self.parse_matrix(B)
+
+    if not A or not B:
+        raise ValueError("Empty matrix")
+
+    rows_A = len(A)
+    cols_A = len(A[0])
+    rows_B = len(B)
+    cols_B = len(B[0])
+
+    if cols_A != rows_B:
+        raise ValueError("Invalid dimensions for multiplication")
+
+    result = []
+    for i in range(rows_A):
+        row = []
+        for j in range(cols_B):
+            val = 0
+            for k in range(cols_A):
+                val += A[i][k] * B[k][j]
+            row.append(val)
+        result.append(row)
+
+    return str(result)
+
 def transpose_matrix(a): pass
diff --git a/test_matrix.py b/test_matrix.py
index e3e3cc1..68390f1 100644
--- a/test_matrix.py
+++ b/test_matrix.py
@@ -1,4 +1,9 @@
 def test_add():
     from matrix import Matrix
     m = Matrix()
-    assert m.matrix_add('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[6, 8], [10, 12]]'
\ No newline at end of file
+    assert m.matrix_add('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[6, 8], [10, 12]]'
+
+def test_multiply():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_multiply('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[19, 22], [43, 50]]'
\ No newline at end of file

From 0289632ce32360c1449eb4fac03fa188309598c4 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:40:31 +0530
Subject: [PATCH 4/8] Added matrix transpose

---
 matrix.py      | 19 +++++++++++++++++--
 test_matrix.py |  7 ++++++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/matrix.py b/matrix.py
index 88db64c..ee0af2d 100644
--- a/matrix.py
+++ b/matrix.py
@@ -25,7 +25,6 @@ def matrix_add(self, A, B):
     return str(result)
 
 def subtract_matrix(a, b): pass
-def multiply_matrix(a, b): pass
 
 def matrix_multiply(self, A, B):
     A = self.parse_matrix(A)
@@ -54,4 +53,20 @@ def matrix_multiply(self, A, B):
 
     return str(result)
 
-def transpose_matrix(a): pass
+def matrix_transpose(self, A):
+    A = self.parse_matrix(A)
+
+    if not A:
+        raise ValueError("Empty matrix")
+
+    rows = len(A)
+    cols = len(A[0])
+
+    result = []
+    for j in range(cols):
+        row = []
+        for i in range(rows):
+            row.append(A[i][j])
+        result.append(row)
+
+    return str(result)
\ No newline at end of file
diff --git a/test_matrix.py b/test_matrix.py
index 68390f1..93f684b 100644
--- a/test_matrix.py
+++ b/test_matrix.py
@@ -6,4 +6,9 @@ def test_add():
 def test_multiply():
     from matrix import Matrix
     m = Matrix()
-    assert m.matrix_multiply('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[19, 22], [43, 50]]'
\ No newline at end of file
+    assert m.matrix_multiply('[[1,2],[3,4]]', '[[5,6],[7,8]]') == '[[19, 22], [43, 50]]'
+
+def test_transpose():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_transpose('[[1,2],[3,4]]') == '[[1, 3], [2, 4]]'
\ No newline at end of file

From 96bd5e957a6ce8fd61f7a37f0001a670f4136019 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:49:42 +0530
Subject: [PATCH 5/8] Added matrix subtraction

---
 __pycache__/calculator.cpython-313.pyc        | Bin 0 -> 1220 bytes
 __pycache__/fraction.cpython-313.pyc          | Bin 0 -> 2287 bytes
 __pycache__/matrix.cpython-313.pyc            | Bin 0 -> 3359 bytes
 ...st_calculator.cpython-313-pytest-9.0.2.pyc | Bin 0 -> 2904 bytes
 ...test_fraction.cpython-313-pytest-9.0.2.pyc | Bin 0 -> 2530 bytes
 .../test_matrix.cpython-313-pytest-9.0.2.pyc  | Bin 0 -> 5102 bytes
 matrix.py                                     |  22 +++++++++++++++++-
 test_matrix.py                                |   7 +++++-
 8 files changed, 27 insertions(+), 2 deletions(-)
 create mode 100644 __pycache__/calculator.cpython-313.pyc
 create mode 100644 __pycache__/fraction.cpython-313.pyc
 create mode 100644 __pycache__/matrix.cpython-313.pyc
 create mode 100644 __pycache__/test_calculator.cpython-313-pytest-9.0.2.pyc
 create mode 100644 __pycache__/test_fraction.cpython-313-pytest-9.0.2.pyc
 create mode 100644 __pycache__/test_matrix.cpython-313-pytest-9.0.2.pyc

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diff --git a/matrix.py b/matrix.py
index ee0af2d..ddaab89 100644
--- a/matrix.py
+++ b/matrix.py
@@ -24,7 +24,27 @@ def matrix_add(self, A, B):
 
     return str(result)
 
-def subtract_matrix(a, b): pass
+def matrix_subtract(self, A, B):
+    A = self.parse_matrix(A)
+    B = self.parse_matrix(B)
+
+    if not A or not B:
+        raise ValueError("Empty matrix")
+
+    rows = len(A)
+    cols = len(A[0])
+
+    if rows != len(B) or cols != len(B[0]):
+        raise ValueError("Matrix dimensions must match")
+
+    result = []
+    for i in range(rows):
+        row = []
+        for j in range(cols):
+            row.append(A[i][j] - B[i][j])
+        result.append(row)
+
+    return str(result)
 
 def matrix_multiply(self, A, B):
     A = self.parse_matrix(A)
diff --git a/test_matrix.py b/test_matrix.py
index 93f684b..eae2a26 100644
--- a/test_matrix.py
+++ b/test_matrix.py
@@ -11,4 +11,9 @@ def test_multiply():
 def test_transpose():
     from matrix import Matrix
     m = Matrix()
-    assert m.matrix_transpose('[[1,2],[3,4]]') == '[[1, 3], [2, 4]]'
\ No newline at end of file
+    assert m.matrix_transpose('[[1,2],[3,4]]') == '[[1, 3], [2, 4]]'
+
+def test_subtract():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_subtract('[[5,6],[7,8]]', '[[1,2],[3,4]]') == '[[4, 4], [4, 4]]'
\ No newline at end of file

From 379cf96892c56a3917f153eae5e7fb2a0f1d0991 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:52:07 +0530
Subject: [PATCH 6/8] Removed __pycache__ and added gitignore

---
 .gitignore                                       |   2 ++
 .vscode/settings.json                            |   4 ++++
 __pycache__/calculator.cpython-313.pyc           | Bin 1220 -> 0 bytes
 __pycache__/fraction.cpython-312.pyc             | Bin 2300 -> 0 bytes
 __pycache__/fraction.cpython-313.pyc             | Bin 2287 -> 0 bytes
 __pycache__/matrix.cpython-313.pyc               | Bin 3359 -> 0 bytes
 .../test_calculator.cpython-313-pytest-9.0.2.pyc | Bin 2904 -> 0 bytes
 __pycache__/test_fraction.cpython-312.pyc        | Bin 2391 -> 0 bytes
 .../test_fraction.cpython-313-pytest-9.0.2.pyc   | Bin 2530 -> 0 bytes
 .../test_matrix.cpython-313-pytest-9.0.2.pyc     | Bin 5102 -> 0 bytes
 10 files changed, 6 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .vscode/settings.json
 delete mode 100644 __pycache__/calculator.cpython-313.pyc
 delete mode 100644 __pycache__/fraction.cpython-312.pyc
 delete mode 100644 __pycache__/fraction.cpython-313.pyc
 delete mode 100644 __pycache__/matrix.cpython-313.pyc
 delete mode 100644 __pycache__/test_calculator.cpython-313-pytest-9.0.2.pyc
 delete mode 100644 __pycache__/test_fraction.cpython-312.pyc
 delete mode 100644 __pycache__/test_fraction.cpython-313-pytest-9.0.2.pyc
 delete mode 100644 __pycache__/test_matrix.cpython-313-pytest-9.0.2.pyc

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7bfcd7a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+__pycache__/
+*.pyc
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..4b5a294
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,4 @@
+{
+    "python-envs.defaultEnvManager": "ms-python.python:conda",
+    "python-envs.defaultPackageManager": "ms-python.python:conda"
+}
\ No newline at end of file
diff --git a/__pycache__/calculator.cpython-313.pyc b/__pycache__/calculator.cpython-313.pyc
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From 09de019fad4f4a6ce411c83dd9d51645927ed0f8 Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 12:56:33 +0530
Subject: [PATCH 7/8] Improved parse_matrix with validation

---
 matrix.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/matrix.py b/matrix.py
index ddaab89..4d563f6 100644
--- a/matrix.py
+++ b/matrix.py
@@ -1,6 +1,21 @@
-def parse_matrix(mat_str):
+def parse_matrix(self, mat_str):
     import ast
-    return ast.literal_eval(mat_str)
+
+    try:
+        mat = ast.literal_eval(mat_str)
+
+        if not isinstance(mat, list) or not mat:
+            raise ValueError("Invalid matrix")
+
+        row_len = len(mat[0])
+        for row in mat:
+            if not isinstance(row, list) or len(row) != row_len:
+                raise ValueError("Irregular matrix")
+
+        return mat
+
+    except:
+        raise ValueError("Invalid matrix format")
 
 def matrix_add(self, A, B):
     A = self.parse_matrix(A)

From 84a3b1bd612869fa24a8db7132fdc9085112605f Mon Sep 17 00:00:00 2001
From: Sarthak Singh <23.sarthak.official@gmail.com>
Date: Mon, 6 Apr 2026 13:04:56 +0530
Subject: [PATCH 8/8] Finalized matrix module with add, subtract, multiply,
 transpose, and robust parsing with tests

---
 matrix.py      | 164 +++++++++++++++++++++++++------------------------
 test_matrix.py |  68 +++++++++++++++++++-
 2 files changed, 152 insertions(+), 80 deletions(-)

diff --git a/matrix.py b/matrix.py
index 4d563f6..e3458d0 100644
--- a/matrix.py
+++ b/matrix.py
@@ -1,107 +1,113 @@
-def parse_matrix(self, mat_str):
-    import ast
+import ast
 
-    try:
-        mat = ast.literal_eval(mat_str)
+class Matrix:
 
-        if not isinstance(mat, list) or not mat:
-            raise ValueError("Invalid matrix")
+    def parse_matrix(self, mat_str):
+        try:
+            mat = ast.literal_eval(mat_str)
 
-        row_len = len(mat[0])
-        for row in mat:
-            if not isinstance(row, list) or len(row) != row_len:
-                raise ValueError("Irregular matrix")
+            if not isinstance(mat, list) or not mat:
+                raise ValueError("Invalid matrix")
 
-        return mat
+            row_len = len(mat[0])
+            for row in mat:
+                if not isinstance(row, list) or len(row) != row_len:
+                    raise ValueError("Irregular matrix")
 
-    except:
-        raise ValueError("Invalid matrix format")
+            return mat
 
-def matrix_add(self, A, B):
-    A = self.parse_matrix(A)
-    B = self.parse_matrix(B)
+        except:
+            raise ValueError("Invalid matrix format")
 
-    if not A or not B:
-        raise ValueError("Empty matrix")
 
-    rows = len(A)
-    cols = len(A[0])
+    def matrix_add(self, A, B):
+        A = self.parse_matrix(A)
+        B = self.parse_matrix(B)
 
-    if rows != len(B) or cols != len(B[0]):
-        raise ValueError("Matrix dimensions must match")
+        if not A or not B:
+            raise ValueError("Empty matrix")
 
-    result = []
-    for i in range(rows):
-        row = []
-        for j in range(cols):
-            row.append(A[i][j] + B[i][j])
-        result.append(row)
+        rows = len(A)
+        cols = len(A[0])
 
-    return str(result)
+        if rows != len(B) or cols != len(B[0]):
+            raise ValueError("Matrix dimensions must match")
 
-def matrix_subtract(self, A, B):
-    A = self.parse_matrix(A)
-    B = self.parse_matrix(B)
+        result = []
+        for i in range(rows):
+            row = []
+            for j in range(cols):
+                row.append(A[i][j] + B[i][j])
+            result.append(row)
 
-    if not A or not B:
-        raise ValueError("Empty matrix")
+        return str(result)
 
-    rows = len(A)
-    cols = len(A[0])
 
-    if rows != len(B) or cols != len(B[0]):
-        raise ValueError("Matrix dimensions must match")
+    def matrix_subtract(self, A, B):
+        A = self.parse_matrix(A)
+        B = self.parse_matrix(B)
 
-    result = []
-    for i in range(rows):
-        row = []
-        for j in range(cols):
-            row.append(A[i][j] - B[i][j])
-        result.append(row)
+        if not A or not B:
+            raise ValueError("Empty matrix")
 
-    return str(result)
+        rows = len(A)
+        cols = len(A[0])
 
-def matrix_multiply(self, A, B):
-    A = self.parse_matrix(A)
-    B = self.parse_matrix(B)
+        if rows != len(B) or cols != len(B[0]):
+            raise ValueError("Matrix dimensions must match")
 
-    if not A or not B:
-        raise ValueError("Empty matrix")
+        result = []
+        for i in range(rows):
+            row = []
+            for j in range(cols):
+                row.append(A[i][j] - B[i][j])
+            result.append(row)
 
-    rows_A = len(A)
-    cols_A = len(A[0])
-    rows_B = len(B)
-    cols_B = len(B[0])
+        return str(result)
 
-    if cols_A != rows_B:
-        raise ValueError("Invalid dimensions for multiplication")
 
-    result = []
-    for i in range(rows_A):
-        row = []
-        for j in range(cols_B):
-            val = 0
-            for k in range(cols_A):
-                val += A[i][k] * B[k][j]
-            row.append(val)
-        result.append(row)
+    def matrix_multiply(self, A, B):
+        A = self.parse_matrix(A)
+        B = self.parse_matrix(B)
 
-    return str(result)
+        if not A or not B:
+            raise ValueError("Empty matrix")
 
-def matrix_transpose(self, A):
-    A = self.parse_matrix(A)
+        rows_A = len(A)
+        cols_A = len(A[0])
+        rows_B = len(B)
+        cols_B = len(B[0])
 
-    if not A:
-        raise ValueError("Empty matrix")
+        if cols_A != rows_B:
+            raise ValueError("Invalid dimensions for multiplication")
 
-    rows = len(A)
-    cols = len(A[0])
+        result = []
+        for i in range(rows_A):
+            row = []
+            for j in range(cols_B):
+                val = 0
+                for k in range(cols_A):
+                    val += A[i][k] * B[k][j]
+                row.append(val)
+            result.append(row)
 
-    result = []
-    for j in range(cols):
-        row = []
-        for i in range(rows):
-            row.append(A[i][j])
-        result.append(row)
+        return str(result)
+
+
+    def matrix_transpose(self, A):
+        A = self.parse_matrix(A)
+
+        if not A:
+            raise ValueError("Empty matrix")
+
+        rows = len(A)
+        cols = len(A[0])
+
+        result = []
+        for j in range(cols):
+            row = []
+            for i in range(rows):
+                row.append(A[i][j])
+            result.append(row)
 
-    return str(result)
\ No newline at end of file
+        return str(result)
\ No newline at end of file
diff --git a/test_matrix.py b/test_matrix.py
index eae2a26..393ac1a 100644
--- a/test_matrix.py
+++ b/test_matrix.py
@@ -16,4 +16,70 @@ def test_transpose():
 def test_subtract():
     from matrix import Matrix
     m = Matrix()
-    assert m.matrix_subtract('[[5,6],[7,8]]', '[[1,2],[3,4]]') == '[[4, 4], [4, 4]]'
\ No newline at end of file
+    assert m.matrix_subtract('[[5,6],[7,8]]', '[[1,2],[3,4]]') == '[[4, 4], [4, 4]]'
+
+def test_add_dimension_mismatch():
+    from matrix import Matrix
+    m = Matrix()
+    try:
+        m.matrix_add('[[1,2]]', '[[1,2],[3,4]]')
+        assert False
+    except ValueError:
+        assert True
+def test_empty_matrix():
+    from matrix import Matrix
+    m = Matrix()
+    try:
+        m.matrix_add('[]', '[]')
+        assert False
+    except ValueError:
+        assert True
+
+def test_invalid_format():
+    from matrix import Matrix
+    m = Matrix()
+    try:
+        m.matrix_add('abc', '[[1,2]]')
+        assert False
+    except ValueError:
+        assert True
+
+def test_irregular_matrix():
+    from matrix import Matrix
+    m = Matrix()
+    try:
+        m.matrix_add('[[1,2],[3]]', '[[1,2],[3,4]]')
+        assert False
+    except ValueError:
+        assert True
+
+def test_multiply_dimension_mismatch():
+    from matrix import Matrix
+    m = Matrix()
+    try:
+        m.matrix_multiply('[[1,2]]', '[[1,2]]')
+        assert False
+    except ValueError:
+        assert True
+
+def test_single_element():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_add('[[5]]', '[[3]]') == '[[8]]'
+
+def test_negative_values():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_add('[[-1,-2],[-3,-4]]', '[[1,2],[3,4]]') == '[[0, 0], [0, 0]]'
+
+def test_transpose_rectangular():
+    from matrix import Matrix
+    m = Matrix()
+    assert m.matrix_transpose('[[1,2,3],[4,5,6]]') == '[[1, 4], [2, 5], [3, 6]]'
+
+def test_large_matrix():
+    from matrix import Matrix
+    m = Matrix()
+    A = '[[1,1],[1,1]]'
+    B = '[[1,1],[1,1]]'
+    assert m.matrix_add(A, B) == '[[2, 2], [2, 2]]'
\ No newline at end of file