added chapter map to README

17-it-generator/aritprog_float_error.py

@@ -0,0 +1,26 @@
+"""
+Demonstrate difference between Arithmetic Progression calculated
+as a series of increments accumulating errors versus one addition
+and one multiplication.
+"""
+
+from fractions import Fraction
+from aritprog_v0 import ArithmeticProgression as APv0
+from aritprog_v1 import ArithmeticProgression as APv1
+
+if __name__ == '__main__':
+
+    ap0 = iter(APv0(1, .1))
+    ap1 = iter(APv1(1, .1))
+    ap_frac = iter(APv1(Fraction(1, 1), Fraction(1, 10)))
+    epsilon = 10**-10
+    iteration = 0
+    delta = next(ap0) - next(ap1)
+    frac = next(ap_frac)
+    while abs(delta) <= epsilon:
+        delta = next(ap0) - next(ap1)
+        frac = next(ap_frac)
+        iteration +=1
+
+    print('iteration: {}\tfraction: {}\tepsilon: {}\tdelta: {}'.
+          format(iteration, frac, epsilon, delta))