def simple_wgraph():
"""Return a simple weighted graph with edges."""
from weighted_graph import WeightedGraph
wg = WeightedGraph()
for edge in SIMPLE_WGRAPH:
wg.add_edge(edge[0], edge[1], edge[2])
return wg
def cyclic():
"""Create simple cyclic graph."""
from weighted_graph import WeightedGraph
empty_wg = WeightedGraph()
empty_wg.add_edge('A', 'B', 5)
empty_wg.add_edge('B', 'C', 5)
empty_wg.add_edge('C', 'A', 5)
return empty_wg
def make_graph_three():
my_graph = WeightedGraph()
my_graph.add_node('a')
my_graph.add_node('b')
my_graph.add_node('c')
my_graph.add_edge('a', 'c')
my_graph.add_edge('b', 'a')
return my_graph
def make_graph():
g = WeightedGraph()
g.add_edge('a', 'b')
g.add_edge('b', 'c')
g.add_edge('c', 'f')
g.add_edge('g', 'f')
g.add_edge('a', 'd')
g.add_edge('d', 'e')
g.add_edge('e', 'a')
return g
def test_prims_lazy_mst():
w_graph = WeightedGraph(4)
w_graph.add_edge(1, 0, -10)
w_graph.add_edge(1, 2, -35)
w_graph.add_edge(0, 2, -15)
w_graph.add_edge(0, 3, -12)
w_graph.add_edge(1, 3, -11)
w_graph.add_edge(2, 3, -30)
prims_lazy = PrimsLazyMst(w_graph)
prims_lazy.get_mst()
def non_ref():
"""Create simple non referential graph."""
from weighted_graph import WeightedGraph
empty_wg = WeightedGraph()
empty_wg.add_edge('A', 'B', 5)
empty_wg.add_edge('A', 'C', 5)
empty_wg.add_edge('B', 'D', 5)
empty_wg.add_edge('B', 'E', 5)
empty_wg.add_edge('C', 'F', 5)
empty_wg.add_edge('C', 'G', 5)
return empty_wg
def test_kruskal():
w_graph = WeightedGraph(4)
w_graph.add_edge(1, 0, -10)
w_graph.add_edge(1, 2, -35)
w_graph.add_edge(0, 2, -15)
w_graph.add_edge(0, 3, -12)
w_graph.add_edge(1, 3, -11)
w_graph.add_edge(2, 3, -30)
'''
w_graph.add_edge(4,6,-1)
w_graph.add_edge(3,8,-2)
w_graph.add_edge(8,7,-5)
w_graph.add_edge(6,8,-8)
w_graph.add_edge(7,6,-17)
'''
k = KruskalMst(w_graph)
k.get_mst()
'''
def make_graph_cycle():
g = WeightedGraph()
g.add_edge('a', 'b')
g.add_edge('b', 'c')
g.add_edge('c', 'a')
return g
lowest_cost = math.inf
lowest_cost_node = None
for node in costs:
cost = costs[node]
if node not in visited and cost < lowest_cost:
lowest_cost = cost
lowest_cost_node = node
return lowest_cost_node
g = WeightedGraph()
g.add_node('A')
g.add_node('B')
g.add_node('C')
g.add_node('D')
g.add_node('E')
g.add_node('F')
g.add_edge('A', 'B', 5)
g.add_edge('A', 'C', 2)
g.add_edge('B', 'C', 8)
g.add_edge('B', 'D', 4)
g.add_edge('B', 'E', 2)
g.add_edge('C', 'E', 7)
g.add_edge('D', 'E', 6)
g.add_edge('D', 'F', 3)
g.add_edge('E', 'F', 1)
dijkstra_1(g, 'A')