tasks a-s

Task/Roots-of-a-function/Python/roots-of-a-function.py

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+f = lambda x: x * x * x - 3 * x * x + 2 * x
+
+step = 0.001 # Smaller step values produce more accurate and precise results
+start = -1
+stop = 3
+
+sign = f(start) > 0
+
+x = start
+while x <= stop:
+    value = f(x)
+
+    if value == 0:
+        # We hit a root
+        print "Root found at", x
+    elif (value > 0) != sign:
+        # We passed a root
+        print "Root found near", x
+
+    # Update our sign
+    sign = value > 0
+
+    x += step