From 78bd8ce98681ec1a5abc59d1bb7b0b5925fefd89 Mon Sep 17 00:00:00 2001
From: dimgrichr <32580033+dimgrichr@users.noreply.github.com>
Date: Wed, 5 Jun 2019 13:41:26 +0300
Subject: [PATCH 1/4] Add files via upload

---
 arithmetic_analysis/secant_method.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 arithmetic_analysis/secant_method.py

diff --git a/arithmetic_analysis/secant_method.py b/arithmetic_analysis/secant_method.py
new file mode 100644
index 000000000000..4cfc39cfd696
--- /dev/null
+++ b/arithmetic_analysis/secant_method.py
@@ -0,0 +1,19 @@
+# Implementing Secant method in Python
+# Author: dimgrichr
+
+
+from math import cos, sin, exp
+def f(x):
+    return 8*x-2*exp(-x);
+
+
+def SecantMethod(lowerBound, upperBound, repeats):
+    x0 = lowerBound;
+    x1 = upperBound;
+    for i in range(0,repeats):
+        x2 = x1 - (f(x1)*(x1-x0))/(f(x1)-f(x0));
+        x0=x1;
+        x1=x2;
+    return x2;
+
+print('The solution is: ' ,SecantMethod(1,3,2));

From f1be3bdd6ca856e31d05963106146bd099583dc9 Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Mon, 28 Oct 2019 19:14:19 +0100
Subject: [PATCH 2/4] Update secant_method.py

---
 arithmetic_analysis/secant_method.py | 31 ++++++++++++++++++----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/arithmetic_analysis/secant_method.py b/arithmetic_analysis/secant_method.py
index 4cfc39cfd696..0a24ed106390 100644
--- a/arithmetic_analysis/secant_method.py
+++ b/arithmetic_analysis/secant_method.py
@@ -2,18 +2,27 @@
 # Author: dimgrichr
 
 
-from math import cos, sin, exp
+from math import cos, exp, sin
+
+
 def f(x):
-    return 8*x-2*exp(-x);
+    """
+    >>> f(5)
+    39.98652410600183
+    """
+    return 8 * x - 2 * exp(-x)
+
 
+def SecantMethod(lower_bound, upper_bound, repeats):
+    """
+    >>> SecantMethod(1, 3, 2)
+    0.2139409276214589
+    """
+    x0 = lower_bound
+    x1 = upper_bound
+    for i in range(0, repeats):
+        x0, x1 = x1, x1 - (f(x1) * (x1 - x0)) / (f(x1) - f(x0))
+    return x1
 
-def SecantMethod(lowerBound, upperBound, repeats):
-    x0 = lowerBound;
-    x1 = upperBound;
-    for i in range(0,repeats):
-        x2 = x1 - (f(x1)*(x1-x0))/(f(x1)-f(x0));
-        x0=x1;
-        x1=x2;
-    return x2;
 
-print('The solution is: ' ,SecantMethod(1,3,2));
+print(f"The solution is: {SecantMethod(1, 3, 2)}")

From f01edda3c6bef038ba265ccdac90fe19e46c14de Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Mon, 28 Oct 2019 19:19:09 +0100
Subject: [PATCH 3/4] Remove unused import

---
 arithmetic_analysis/secant_method.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arithmetic_analysis/secant_method.py b/arithmetic_analysis/secant_method.py
index 0a24ed106390..37a714a74575 100644
--- a/arithmetic_analysis/secant_method.py
+++ b/arithmetic_analysis/secant_method.py
@@ -2,7 +2,7 @@
 # Author: dimgrichr
 
 
-from math import cos, exp, sin
+from math import exp, sin
 
 
 def f(x):

From a0ca7609340dc55a88fb31ebe8100d1cfa442e39 Mon Sep 17 00:00:00 2001
From: Christian Clauss <cclauss@me.com>
Date: Mon, 28 Oct 2019 19:23:44 +0100
Subject: [PATCH 4/4] Remove unused import

---
 arithmetic_analysis/secant_method.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arithmetic_analysis/secant_method.py b/arithmetic_analysis/secant_method.py
index 37a714a74575..b05d44c627d8 100644
--- a/arithmetic_analysis/secant_method.py
+++ b/arithmetic_analysis/secant_method.py
@@ -2,7 +2,7 @@
 # Author: dimgrichr
 
 
-from math import exp, sin
+from math import exp
 
 
 def f(x):