Merge pull request #321 from nella17/nella17-patch

Add Stationary Points

mathgenerator/funcs/__init__.py

@@ -114,3 +114,4 @@ from .signum_function import *
 from .conditional_probability import *
 from .arc_length import *
 from .binomial_distribution import *
+from .stationary_points import *

mathgenerator/funcs/stationary_points.py

@@ -0,0 +1,23 @@
+from .__init__ import *
+import sympy
+
+
+def stationaryPointsFunc(maxExp=3, maxCoef=10):
+    while True:
+        x = sympy.symbols('x')
+        problem = 0
+        for exp in range(maxExp + 1):
+            coefficient = random.randint(0, maxCoef)
+            problem += coefficient * pow(x, exp)
+        solution = sympy.stationary_points(problem, x)
+
+        if len(solution) != 0:
+            solution = ','.join('({},{})'.format(
+                str(p),
+                sympy.sympify(problem.replace(x, p))
+            ) for p in solution)
+            problem = 'f(x)=' + str(problem).replace('**', '^')
+            return problem, solution
+
+
+stationary_points = Generator("Stationary Points", 106, "f(x)=x^3-3x", "(-1,2),(1,-2)", stationaryPointsFunc)