def KS_test_2(data1, data2):
data1 = np.copy(data1)
data2 = np.copy(data2)
mergesort(data1)
mergesort(data2)
N1 = len(data1)
N2 = len(data2)
D = 0
i1 = i2 = 0
f1 = f2 = 0
while i1 < N1 and i2 < N2:
d1 = data1[i1]
d2 = data2[i2]
if d1 <= d2:
i1 += 1
f1 = i1 / N1
if d2 <= d1:
i2 += 1
f2 = i2 / N2
distance = np.abs(f2 - f1)
if distance > D:
D = distance
N_eff_sqrt = np.sqrt((N1 * N2) / (N1 + N2))
p_val = 1 - KS_cdf(D * (N_eff_sqrt + 0.12 + 0.11 / N_eff_sqrt))
return D, p_val
def median_of_medians(a):
n = len(a)
p = range(0, n, 5) + [n]
sublist = [a[p[i]:p[i+1]] for i in range(len(p)-1)]
mergelist = [mergesort(s)[len(s)/2] for s in sublist]
# TODO: make this call recursive
return mergelist[len(mergelist)/2]
def search(arr, item):
"""Performs binary search on an array
with the given item and returns True or
False.
>>> search([5, 4, 1, 6, 2, 3, 9, 7], 2)
True
>>> search([5, 4, 1, 6, 2, 3, 9, 7], 8)
False
"""
arr = mergesort(arr)
first = 0
last = len(arr) - 1
found = False
while first <= last and not found:
midpoint = (first + last) // 2
if arr[midpoint] == item:
found = True
else:
if item < arr[midpoint]:
last = midpoint - 1
else:
first = midpoint + 1
return found
def median_of_medians(a):
n = len(a)
p = range(0, n, 5) + [n]
sublist = [a[p[i]:p[i+1]] for i in range(len(p)-1)]
mergelist = [mergesort(s)[len(s)/2] for s in sublist]
# TODO: make this call recursive
return mergelist[len(mergelist)/2]
def KS_test(data, cdf):
data = np.copy(data)
mergesort(data)
N = len(data)
D = 0
prev_cdf = 0
for i, sample in enumerate(data):
data_cdf = (i + 1) / N
dist_cdf = cdf(sample)
distance = max(np.abs(data_cdf - dist_cdf),
np.abs(prev_cdf - dist_cdf))
if distance > D:
D = distance
prev_cdf = data_cdf
p_val = 1 - KS_cdf(D * (N**0.5 + 0.12 + 0.11 * N**-0.5))
return D, p_val
def Kuipers_test(data, cdf):
# Note that the p values returned are only accurate if they are small
# Accurate within 2 decimal places for p < 0.74
# Thus, a rejection of H0 is real, but the p-values are not distributed
# as could be expected
data = np.copy(data)
mergesort(data)
N = len(data)
D_plus = 0
D_minus = 0
prev_cdf = 0
for i, sample in enumerate(data):
data_cdf = (i + 1) / N
dist_cdf = cdf(sample)
distance_plus = data_cdf - dist_cdf
distance_minus = dist_cdf - prev_cdf
if distance_plus > D_plus:
D_plus = distance_plus
if distance_minus > D_minus:
D_minus = distance_minus
prev_cdf = data_cdf
D = D_minus + D_plus
p_val = Kuipers_cdf(D * (N**0.5 + 0.155 + 0.24 * N**-0.5))
return D, p_val
def test_min_mergesort():
sorted_items = [KeyedItem(key=i) for i in range(100)]
items = [item for item in sorted_items]
random.shuffle(items)
mergesort(items)
assert items == sorted_items
def test_max_mergesort():
sorted_items = [KeyedItem(key=i) for i in range(99, -1, -1)]
items = [item for item in sorted_items]
random.shuffle(items)
mergesort(items, order='max')
assert items == sorted_items
selection_sort = Button(root,
text="Selection sort",
command=lambda: sorting.selectionsort())
selection_sort.grid(row=0, column=0)
quick_sort = Button(
root,
text="Quick sort",
command=lambda: sorting.quickSort_high_pivot(0,
len(value_arry) - 1))
quick_sort.grid(row=0, column=1)
merge_sort = Button(
root,
text="Merge sort",
command=lambda: sorting.mergesort(value_arry, rect_arry, 0))
merge_sort.grid(row=0, column=2)
insertion_sort = Button(root,
text="Insertion sort",
command=lambda: sorting.insertionsort())
insertion_sort.grid(row=0, column=3)
bubble_sort = Button(root,
text="Bubble sort",
command=lambda: sorting.bubblesort())
bubble_sort.grid(row=0, column=4)
#creates scale setting
array_size = Scale(root, from_=10, to=200, orient=HORIZONTAL, length=400)
array_size.grid(row=0, column=5)
def test_mergesort():
list = generateRandomList()
sorting.mergesort(list)
assert (is_sorted(list))
def test_mergesort(self):
correct = self.array[::]
correct.sort()
sorting.mergesort(self.array)
self.assertEqual(self.array, correct)
def test_mergesort(self):
correct = self.array[::]
correct.sort()
sorting.mergesort(self.array)
self.assertEqual(self.array, correct)
def continousGini(column, itsLabel):
a = column[:]
l = itsLabel[:]
mergesort(a, l)
avg_gini = {}
avg_gini[a[0]] = {}
i = 0
#print a
while i < len(a) - 1:
avg_gini[int((a[i] + a[i + 1]) / 2)] = {}
i = i + 1
avg_gini[a[len(a) - 1]] = {}
avg_gini_cont = {}
for x in avg_gini:
avg_gini_cont[x] = {}
avg_gini_cont[x]['yes'] = 0
avg_gini_cont[x]['no'] = 0
avg_gini[x]['yes'] = 0
avg_gini[x]['no'] = 0
for y in avg_gini[x]:
avg_gini[x][y] = {}
for z in types_lables:
avg_gini[x][y][z] = 0
i = 0
while i < len(a):
for x in avg_gini:
if a[i] <= x:
avg_gini[x]['yes'][l[i]] = avg_gini[x]['yes'].get(l[i], 0) + 1
else:
avg_gini[x]['no'][l[i]] = avg_gini[x]['no'].get(l[i], 0) + 1
i = i + 1
for x in avg_gini:
avg_gini_cont[x]['yes'] = sum(avg_gini[x]['yes'].values())
avg_gini_cont[x]['no'] = sum(avg_gini[x]['no'].values())
avg_gini_val = {}
for x in avg_gini:
yes_dic = avg_gini[x]['yes']
no_dic = avg_gini[x]['no']
yes_tot = 0.0
no_tot = 0.0
for y in types_lables:
yes_tot += yes_dic[y]
no_tot += no_dic[y]
yes_psum = 0.0
no_psum = 0.0
for y in types_lables:
if yes_tot != 0:
yes_psum += pow(float(yes_dic[y]) / float(yes_tot), 2)
if no_tot != 0:
no_psum += pow(float(no_dic[y]) / float(no_tot), 2)
if yes_psum != 0:
yes_psum = round(1.0 - yes_psum, 4)
if no_psum != 0:
no_psum = round(1.0 - no_psum, 4)
total_sum = 0.0
total_sum = yes_psum*(float(avg_gini_cont[x]['yes'])/(float(len(a)))) + \
no_psum*(float(avg_gini_cont[x]['no'])/(float(len(a))))
avg_gini_val[x] = round(total_sum, 4)
#print avg_gini_cont
#print avg_gini
#print avg_gini_val
#print len(avg_gini)
min_gini = min(avg_gini_val.values())
split_value = avg_gini_val.keys()[avg_gini_val.values().index(min_gini)]
#print min_gini,split_value
return min_gini, split_value
def test_mergesort():
the_list = fill_random_list()
assert sorting.mergesort(the_list) == sorted(the_list)