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graph/path: indicate negative cycle weights with -Inf instead of NaN

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The paths are undefined, but the limit of the path weight is -Inf.
This commit is contained in:
Dan Kortschak
2019-02-07 20:57:33 +10:30
parent 936e3fec9e
commit ee7dd3742a
3 changed files with 14 additions and 14 deletions
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6
graph/path/negative_cycles_example_test.go
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@@ -46,7 +46,7 @@ func ExampleBellmanFordFrom_negativecycles() {
}
for _, id := range []int64{'a', 'b', 'c', 'd', 'e', 'f'} {
p, w := pt.To(id)
if math.IsNaN(w) {
if math.IsInf(w, -1) {
fmt.Printf("negative cycle in path to %c path:%c\n", id, p)
}
}
@@ -87,7 +87,7 @@ func ExampleFloydWarshall_negativecycles() {
ids := []int64{'a', 'b', 'c', 'd', 'e', 'f'}
for _, id := range ids {
if math.IsNaN(pt.Weight(id, id)) {
if math.IsInf(pt.Weight(id, id), -1) {
fmt.Printf("%c is in a negative cycle\n", id)
}
}
@@ -95,7 +95,7 @@ func ExampleFloydWarshall_negativecycles() {
for _, uid := range ids {
for _, vid := range ids {
_, w, unique := pt.Between(uid, vid)
if math.IsNaN(w) {
if math.IsInf(w, -1) {
fmt.Printf("negative cycle in path from %c to %c unique=%t\n", uid, vid, unique)
}
}