Open-Argon/argon-v3
1
0
Fork 0
mirror of https://github.com/Open-Argon/argon-v3.git synced 2025-12-06 00:46:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

fix trig inaccurate when given a large input

Browse Source
This commit is contained in:
William Bell
2024-03-14 12:51:50 +00:00
parent 23a9a443d6
commit 269430b025
3 changed files with 34 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
src/trig.go
View File

@@ -7,6 +7,18 @@ import (
var PIFloatInaccuracy number = newNumber()
type sinCacheValue struct {
INPUT number
OUTPUT number
}
var sinCache = []sinCacheValue{
{newNumber(), newNumber()},
{newNumber().Quo(PI, newNumber().SetInt64(2)), newNumber().SetInt64(1)},
{PI, newNumber()},
{newNumber().Add(PI, newNumber().Quo(PI, newNumber().SetInt64(2))), newNumber().SetInt64(-1)},
}
func init() {
PIFloatInaccuracy.SetFloat64(math.Asin(1) * 2)
}
@@ -25,6 +37,18 @@ var ArSin = builtinFunc{"sin", func(args ...any) (any, ArErr) {
}
}
num := newNumber().Set(args[0].(number))
toTrim := newNumber().Mul(PI, newNumber().SetInt64(2))
toTrim.Quo(num, toTrim)
toTrim = floor(toTrim)
toTrim.Mul(toTrim, newNumber().Mul(PI, newNumber().SetInt64(2)))
num.Sub(num, toTrim)
for i := 0; i < len(sinCache); i++ {
if sinCache[i].INPUT.Cmp(num) == 0 {
return sinCache[i].OUTPUT, ArErr{}
}
}
num.Quo(num, PI)
num.Mul(num, PIFloatInaccuracy)
n, _ := num.Float64()
@@ -71,12 +95,7 @@ var ArCos = builtinFunc{"cos", func(args ...any) (any, ArErr) {
EXISTS: true,
}
}
num := newNumber().Set(args[0].(number))
num.Quo(num, PI)
num.Mul(num, PIFloatInaccuracy)
n, _ := num.Float64()
outputnum := newNumber().SetFloat64(math.Cos(n))
return outputnum, ArErr{}
return builtinCall(ArSin, []any{newNumber().Add(args[0].(number), newNumber().Quo(PI, newNumber().SetInt64(2)))})
}}
var ArArccos = builtinFunc{"arccos", func(args ...any) (any, ArErr) {
if len(args) != 1 {