Horse racing: Difference between revisions
Added Go
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Other things being equal (which they seldom are in actual horse racing!) what would you '''''expect''''' the '''full result''' of Race 4 to be including the '''time''' of the winner?
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=={{header|Go}}==
{{trans|Wren}}
<lang go>package main
import (
"fmt"
"sort"
"strings"
)
func main() {
// ratings on past form, assuming a rating of 100 for horse A
a := 100
b := a - 8 - 2*2 // carried 8 lbs less, finished 2 lengths behind
c := a + 4 - 2*3.5
d := a - 4 - 10*0.4 // based on relative weight and time
e := d + 7 - 2*1
f := d + 11 - 2*(4-2)
g := a - 10 + 10*0.2
h := g + 6 - 2*1.5
i := g + 15 - 2*2
// adjustments to ratings for current race
b += 4
c -= 4
h += 3
j := a - 3 + 10*0.2
// filly's allowance to give weight adjusted weighting
b += 3
d += 3
i += 3
j += 3
// create map of horse to its weight adjusted rating and whether colt (1 == yes, 0 == no)
m := map[string][2]int{
"A": {a, 1},
"B": {b, 0},
"C": {c, 1},
"D": {d, 0},
"E": {e, 1},
"F": {f, 1},
"G": {g, 1},
"H": {h, 1},
"I": {i, 0},
"J": {j, 0},
}
type kv struct {
key string
value [2]int
}
// convert to slice of kv
l := make([]kv, len(m))
x := 0
for k, v := range m {
l[x] = kv{k, v}
x++
}
// sort in descending order of rating
sort.Slice(l, func(i, j int) bool { return l[i].value[0] > l[j].value[0] })
// show expected result of race
fmt.Println("Race 4\n")
fmt.Println("Pos Horse Weight Dist Sex")
pos := ""
for x := 0; x < len(l); x++ {
wt := "9.00"
if l[x].value[1] == 0 {
wt = "8.11"
}
dist := 0.0
if x > 0 {
dist = float64(l[x-1].value[0]-l[x].value[0]) * 0.5
}
if x == 0 || dist > 0.0 {
pos = fmt.Sprintf("%d", x+1)
} else if !strings.HasSuffix(pos, "=") {
pos = fmt.Sprintf("%d=", x)
}
sx := "colt"
if l[x].value[1] == 0 {
sx = "filly"
}
fmt.Printf("%-2s %s %s %3.1f %s\n", pos, l[x].key, wt, dist, sx)
}
// weight adjusted rating of winner
wr := float64(l[0].value[0])
// expected time of winner (relative to A's time in Race 1)
t := 96.0 - (wr-100)/10
min := int(t / 60)
sec := t - float64(min)*60
fmt.Printf("\nTime %d minute %3.1f seconds\n", min, sec)
}</lang>
{{out}}
<pre>
Race 4
Pos Horse Weight Dist Sex
1 I 8.11 0.0 filly
2 J 8.11 2.0 filly
3 A 9.00 1.0 colt
4 F 9.00 0.5 colt
5 H 9.00 0.5 colt
6 E 9.00 0.5 colt
7 D 8.11 1.0 filly
7= B 8.11 0.0 filly
9 C 9.00 1.0 colt
10 G 9.00 0.5 colt
Time 1 minute 35.4 seconds
</pre>
=={{header|Wren}}==
{{libheader|Wren-fmt}}
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