diff --git a/doc/gwt_mine.py b/doc/gwt_mine.py
new file mode 100644
index 0000000..42ba046
--- /dev/null
+++ b/doc/gwt_mine.py
@@ -0,0 +1,7 @@
+def mine_gwt(x):
+    return 0.2 + (1.8*x) / (x + 1)
+
+X = 0
+while X<10:
+    print(mine_gwt(X))
+    X = X + 0.1
\ No newline at end of file