/
poisson_process.go
43 lines (39 loc) · 1.09 KB
/
poisson_process.go
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package phenomena
import (
"github.com/umbralcalc/stochadex/pkg/simulator"
"golang.org/x/exp/rand"
"gonum.org/v1/gonum/stat/distuv"
)
// PoissonProcessIteration defines an iteration for a simple Poisson
// process.
type PoissonProcessIteration struct {
unitUniformDist *distuv.Uniform
}
func (p *PoissonProcessIteration) Configure(
partitionIndex int,
settings *simulator.Settings,
) {
p.unitUniformDist = &distuv.Uniform{
Min: 0.0,
Max: 1.0,
Src: rand.NewSource(settings.Seeds[partitionIndex]),
}
}
func (p *PoissonProcessIteration) Iterate(
params *simulator.OtherParams,
partitionIndex int,
stateHistories []*simulator.StateHistory,
timestepsHistory *simulator.CumulativeTimestepsHistory,
) []float64 {
stateHistory := stateHistories[partitionIndex]
values := make([]float64, stateHistory.StateWidth)
for i := range values {
if params.FloatParams["rates"][i] > (params.FloatParams["rates"][i]+
(1.0/timestepsHistory.NextIncrement))*p.unitUniformDist.Rand() {
values[i] = stateHistory.Values.At(0, i) + 1.0
} else {
values[i] = stateHistory.Values.At(0, i)
}
}
return values
}