Golang IsNaN示例

说明

golang isnan示例是从最受好评的开源项目中提取的实现代码,你可以参考下面示例的使用方式。

编程语言: Golang

命名空间/包名称: math

示例#1
文件: run_test.go 项目: goulash/stat

func TestRunSeries(z *testing.T) {
	assert := assert.New(z)
	var assertFloat = func(a, b float64) {
		if math.IsNaN(a) && math.IsNaN(b) {
			return // ok
		}
		assert.Equal(a, b)
	}

	tests := []Series{
		{1, 2, 3, 4, 5},
		{0.38809179, 0.94113008, 0.15350705, 0.03311646, 0.68168087, 0.21719990},
		{0.32123922, 0.57085251, 0.53576882, 0.38965630, 0.27487263, 0.90783122},
		{0, 0, 0, 0, 0},
		{-1, -2, -3},
		{},
	}

	for _, t := range tests {
		var r Run
		for _, f := range t {
			r.Add(f)
		}

		assertFloat(t.Min(), r.Min())
		assertFloat(t.Max(), r.Max())
		assertFloat(t.Mean(), r.Mean())
		assertFloat(t.Var(), r.Var())
		assertFloat(t.Std(), r.Std())
		assertFloat(t.VarP(), r.VarP())
		assertFloat(t.StdP(), r.StdP())
	}
}

示例#2
文件: evaluate.go 项目: vozhyk-/gohan

func calculateLessThan(left Value, right Value, leftFirst bool) _lessThanResult {

	x := Value{}
	y := x

	if leftFirst {
		x = toNumberPrimitive(left)
		y = toNumberPrimitive(right)
	} else {
		y = toNumberPrimitive(right)
		x = toNumberPrimitive(left)
	}

	result := false
	if x.kind != valueString || y.kind != valueString {
		x, y := x.float64(), y.float64()
		if math.IsNaN(x) || math.IsNaN(y) {
			return lessThanUndefined
		}
		result = x < y
	} else {
		x, y := x.string(), y.string()
		result = x < y
	}

	if result {
		return lessThanTrue
	}

	return lessThanFalse
}

示例#3
文件: value.go 项目: Codzart/go-ethereum

func strictEqualityComparison(x Value, y Value) bool {
	if x.kind != y.kind {
		return false
	}
	result := false
	switch x.kind {
	case valueUndefined, valueNull:
		result = true
	case valueNumber:
		x := x.float64()
		y := y.float64()
		if math.IsNaN(x) && math.IsNaN(y) {
			result = false
		} else {
			result = x == y
		}
	case valueString:
		result = x.string() == y.string()
	case valueBoolean:
		result = x.bool() == y.bool()
	case valueObject:
		result = x._object() == y._object()
	default:
		panic(hereBeDragons())
	}

	return result
}

示例#4
文件: graphics.go 项目: johnvilsack/golang-stuff

// GenericBoxes draws box plots. (Default implementation for box plots).
// The values for each box in boxes are in screen coordinates!
func GenericBoxes(bg BasicGraphics, boxes []Box, width int, style Style) {
	if width%2 == 0 {
		width += 1
	}
	hbw := (width - 1) / 2
	for _, d := range boxes {
		x := int(d.X)
		q1, q3 := int(d.Q1), int(d.Q3)
		// DebugLogger.Printf("q1=%d  q3=%d  q3-q1=%d", q1,q3,q3-q1)
		bg.Rect(x-hbw, q1, width, q3-q1, style)
		if !math.IsNaN(d.Med) {
			med := int(d.Med)
			bg.Line(x-hbw, med, x+hbw, med, style)
		}

		if !math.IsNaN(d.Avg) {
			bg.Symbol(x, int(d.Avg), style)
		}

		if !math.IsNaN(d.High) {
			bg.Line(x, q3, x, int(d.High), style)
		}

		if !math.IsNaN(d.Low) {
			bg.Line(x, q1, x, int(d.Low), style)
		}

		for _, y := range d.Outliers {
			bg.Symbol(x, int(y), style)
		}

	}

}

示例#5
文件: datum.go 项目: nvanbenschoten/cockroach

// Compare implements the Datum interface.
func (d *DFloat) Compare(other Datum) int {
	if other == DNull {
		// NULL is less than any non-NULL value.
		return 1
	}
	v, ok := other.(*DFloat)
	if !ok {
		cmp, ok := mixedTypeCompare(d, other)
		if !ok {
			panic(makeUnsupportedComparisonMessage(d, other))
		}
		return cmp
	}
	if *d < *v {
		return -1
	}
	if *d > *v {
		return 1
	}
	// NaN sorts before non-NaN (#10109).
	if *d == *v {
		return 0
	}
	if math.IsNaN(float64(*d)) {
		if math.IsNaN(float64(*v)) {
			return 0
		}
		return -1
	}
	return 1
}

示例#6
文件: boogie.go 项目: nlefler/VictoryBoogieWoogie

func PixelDistance(image image.Image, x, y int, r, g, b, a uint32) float64 {
	if x < image.Bounds().Min.X ||
		y < image.Bounds().Min.Y ||
		x > image.Bounds().Max.X ||
		y > image.Bounds().Max.Y {
		log.Printf("Invalid pixel at %d, %d", x, y)
		return 0.0
	}

	targetR, targetG, targetB, targetA := image.At(x, y).RGBA()

	distance := 0.0
	distance += math.Pow(float64(r-targetR), 2)
	if math.IsNaN(distance) {
		log.Printf("Distance is NaN after red at %d, %d", x, y)
	}
	distance += math.Pow(float64(g-targetG), 2)
	if math.IsNaN(distance) {
		log.Printf("Distance is NaN after green at %d, %d", x, y)
	}
	distance += math.Pow(float64(b-targetB), 2)
	if math.IsNaN(distance) {
		log.Printf("Distance is NaN after blue at %d, %d", x, y)
	}
	distance += math.Pow(float64(a-targetA), 2)
	if math.IsNaN(distance) {
		log.Printf("Distance is NaN after alpha at %d, %d", x, y)
	}
	distance = math.Sqrt(distance)
	if math.IsNaN(distance) {
		log.Printf("Distance is NaN after sqrt at %d, %d", x, y)
	}

	return distance
}

示例#7
文件: expr.go 项目: tsheasha/carbonapi

func (w *Windowed) Push(n float64) {
	old := w.data[w.head]

	w.length++

	w.data[w.head] = n
	w.head++
	if w.head >= len(w.data) {
		w.head = 0
	}

	if !math.IsNaN(old) {
		w.sum -= old
		w.sumsq -= (old * old)
	} else {
		w.nans--
	}

	if !math.IsNaN(n) {
		w.sum += n
		w.sumsq += (n * n)
	} else {
		w.nans++
	}
}

示例#8
文件: config.go 项目: kyeongdong/3

func noNaN(v data.Vector, pol int) data.Vector {
	if math.IsNaN(v[X]) || math.IsNaN(v[Y]) || math.IsNaN(v[Z]) {
		return data.Vector{0, 0, float64(pol)}
	} else {
		return v
	}
}

示例#9
文件: pearson.go 项目: nnuss/go-onlinestats

func Pearson(a, b []float64) float64 {

	if len(a) != len(b) {
		panic("len(a) != len(b)")
	}

	var abar, bbar float64
	var n int
	for i := range a {
		if !math.IsNaN(a[i]) && !math.IsNaN(b[i]) {
			abar += a[i]
			bbar += b[i]
			n++
		}
	}
	nf := float64(n)
	abar, bbar = abar/nf, bbar/nf

	var numerator float64
	var sumAA, sumBB float64

	for i := range a {
		if !math.IsNaN(a[i]) && !math.IsNaN(b[i]) {
			numerator += (a[i] - abar) * (b[i] - bbar)
			sumAA += (a[i] - abar) * (a[i] - abar)
			sumBB += (b[i] - bbar) * (b[i] - bbar)
		}
	}

	return numerator / (math.Sqrt(sumAA) * math.Sqrt(sumBB))
}

示例#10
文件: num.go 项目: andydude/droscheme

func (o Sfloat64) Equal(n Any) bool {
	m := n.(Sfloat64)
	if math.IsNaN(float64(o)) && math.IsNaN(float64(m)) {
		return false
	}
	return o == m
}

示例#11
文件: auxiliary.go 项目: yunpeng1/gosl

func TestAbs(result, expected, absolute_error float64, test_description string) (status int) {
	switch {
	case math.IsNaN(result) || math.IsNaN(expected):
		status = NaN

	case math.IsInf(result, 0) || math.IsInf(expected, 0):
		status = Inf

	case (expected > 0 && expected < DBL_MIN) || (expected < 0 && expected > -DBL_MIN):
		status = NotEqual

	default:
		if math.Abs(result-expected) > absolute_error {
			status = NotEqual
		} else {
			status = Equal
		}
	}
	if test_description != "" {
		io.Pf(test_description)
		switch status {
		case NaN:
			io.Pf(" [1;31mNaN[0m\n  %v observed\n  %v expected.  diff = %v\n", result, expected, result-expected)
		case Inf:
			io.Pf(" [1;31mInf[0m\n  %v observed\n  %v expected.  diff = %v\n", result, expected, result-expected)
		case Equal:
			io.Pf(" [1;32mOk[0m\n  %v observed\n  %v expected.  diff = %v\n", result, expected, result-expected)
		case NotEqual:
			io.Pf(" [1;31mError[0m\n  %v observed\n  %v expected.  diff = %v\n", result, expected, result-expected)
		}
	}
	return
}

示例#12
文件: units.go 项目: diffeo/go-coordinate

// PrioritizeWorkUnits changes the priorities of some number of work
// units.  The actual work units are in options["work_unit_keys"].  A
// higher priority results in the work units being scheduled sooner.
func (jobs *JobServer) PrioritizeWorkUnits(workSpecName string, options map[string]interface{}) (bool, string, error) {
	var (
		err      error
		query    coordinate.WorkUnitQuery
		workSpec coordinate.WorkSpec
	)
	pwuOptions := PrioritizeWorkUnitsOptions{
		Priority:   math.NaN(),
		Adjustment: math.NaN(),
	}
	workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
	if err == nil {
		err = decode(&pwuOptions, options)
	}
	if err == nil && pwuOptions.WorkUnitKeys == nil {
		return false, "missing work_unit_keys", err
	}
	if err == nil {
		query.Names = pwuOptions.WorkUnitKeys
		if !math.IsNaN(pwuOptions.Priority) {
			err = workSpec.SetWorkUnitPriorities(query, pwuOptions.Priority)
		} else if !math.IsNaN(pwuOptions.Adjustment) {
			err = workSpec.AdjustWorkUnitPriorities(query, pwuOptions.Adjustment)
		}
	}
	return err == nil, "", err
}

示例#13
文件: gotracker.go 项目: etherealmachine/hivemind

func (t *GoTracker) updateWeights(vertex int) {
	if t.board[vertex] != EMPTY {
		for i := 0; i < 4; i++ {
			adj := t.adj[vertex][i]
			if adj != -1 && t.board[adj] == EMPTY {
				t.updateWeights(adj)
			}
		}
	} else {
		black_weight := t.weights.Get(BLACK, vertex)
		if black_weight != 0 {
			weight := t.get_weight(BLACK, vertex)
			if math.IsNaN(weight) {
				black_weight = 0
			} else if black_weight+weight > 0 {
				black_weight += weight
			}
		}
		t.weights.Set(BLACK, vertex, black_weight)
		white_weight := t.weights.Get(WHITE, vertex)
		if white_weight != 0 {
			weight := t.get_weight(WHITE, vertex)
			if math.IsNaN(weight) {
				white_weight = 0
			} else if white_weight+weight > 0 {
				white_weight += weight
			}
		}
		t.weights.Set(WHITE, vertex, white_weight)
	}
}

示例#14
文件: server.go 项目: robmerrell/btbboard

// parseAverages takes a slice of averages and returns a string representation for flot to graph
func parseAverages(averages []*models.Average, useBtcField bool) string {
	var format string
	if useBtcField {
		format = "[%g, %.8f]"
	} else {
		format = "[%g, %.2f]"
	}

	parsed := ""
	for i, average := range averages {
		if math.IsNaN(average.Cryptsy.Usd) || math.IsNaN(average.Cryptsy.Btc) {
			continue
		}

		timeIndex := float64(average.TimeBlock.Unix()) * 1000.0
		var value float64
		if useBtcField {
			value = average.Cryptsy.Btc
		} else {
			value = average.Cryptsy.Usd
		}

		parsed += fmt.Sprintf(format, timeIndex, value)

		if i < len(averages)-1 {
			parsed += ","
		}
	}

	return parsed
}

示例#15
文件: functions.go 项目: PrFalken/prometheus

// === changes(matrix model.ValMatrix) Vector ===
func funcChanges(ev *evaluator, args Expressions) model.Value {
	in := ev.evalMatrix(args[0])
	out := make(vector, 0, len(in))

	for _, samples := range in {
		changes := 0
		prev := model.SampleValue(samples.Values[0].Value)
		for _, sample := range samples.Values[1:] {
			current := sample.Value
			if current != prev && !(math.IsNaN(float64(current)) && math.IsNaN(float64(prev))) {
				changes++
			}
			prev = current
		}

		rs := &sample{
			Metric:    samples.Metric,
			Value:     model.SampleValue(changes),
			Timestamp: ev.Timestamp,
		}
		rs.Metric.Del(model.MetricNameLabel)
		out = append(out, rs)
	}
	return out
}

示例#16
文件: example.go 项目: ncsibra/xgo

func KindFromSides(a, b, c float64) Kind {
	if math.IsNaN(a) || math.IsNaN(b) || math.IsNaN(c) {
		return NaT
	}
	if a > b {
		a, b = b, a
	}
	if b > c {
		b, c = c, b
	}
	if a > b {
		a, b = b, a
	}
	// sides are now sorted
	switch {
	case a <= 0:
		return NaT
	case a+b <= c: // triangle inequality
		return NaT
	case a == b:
		if b == c {
			return Equ
		}
		return Iso
	case a == c || b == c:
		return Iso
	}
	return Sca
}

示例#17
文件: positioning.go 项目: raylee/gocnc

// Appends a position to the stack
func (vm *Machine) move(x, y, z float64) {
	if math.IsNaN(x) || math.IsNaN(y) || math.IsNaN(z) {
		panic("Internal failure: Move attempted with NaN value")
	}
	pos := Position{vm.State, x, y, z}
	vm.Positions = append(vm.Positions, pos)
}

示例#18
文件: text.go 项目: mike1372/chart

func (g *TextGraphics) Scatter(points []chart.EPoint, plotstyle chart.PlotStyle, style chart.Style) {
	// First pass: Error bars
	for _, p := range points {
		xl, yl, xh, yh := p.BoundingBox()
		if !math.IsNaN(p.DeltaX) {
			g.tb.Line(int(xl), int(p.Y), int(xh), int(p.Y), '-')
		}
		if !math.IsNaN(p.DeltaY) {
			g.tb.Line(int(p.X), int(yl), int(p.X), int(yh), '|')
		}
	}

	// Second pass: Line
	if (plotstyle&chart.PlotStyleLines) != 0 && len(points) > 0 {
		lastx, lasty := int(points[0].X), int(points[0].Y)
		for i := 1; i < len(points); i++ {
			x, y := int(points[i].X), int(points[i].Y)
			// fmt.Printf("LineSegment %d (%d,%d) -> (%d,%d)\n", i, lastx,lasty,x,y)
			g.tb.Line(lastx, lasty, x, y, rune(style.Symbol))
			lastx, lasty = x, y
		}
	}

	// Third pass: symbols
	if (plotstyle&chart.PlotStylePoints) != 0 && len(points) != 0 {
		for _, p := range points {
			g.tb.Put(int(p.X), int(p.Y), rune(style.Symbol))
		}
	}
	// chart.GenericScatter(g, points, plotstyle, style)
}

示例#19
文件: evaluate_expression.go 项目: couchbaselabs/otto

func calculateLessThan(left Value, right Value, leftFirst bool) _lessThanResult {

	x := UndefinedValue()
	y := x

	if leftFirst {
		x = toNumberPrimitive(left)
		y = toNumberPrimitive(right)
	} else {
		y = toNumberPrimitive(right)
		x = toNumberPrimitive(left)
	}

	result := false
	if x._valueType != valueString || y._valueType != valueString {
		x, y := x.toFloat(), y.toFloat()
		if math.IsNaN(x) || math.IsNaN(y) {
			return lessThanUndefined
		}
		result = x < y
	} else {
		x, y := x.toString(), y.toString()
		result = x < y
	}

	if result {
		return lessThanTrue
	}

	return lessThanFalse
}

示例#20
文件: functions.go 项目: jcnnghm/plot

// Plot implements the Plotter interface, drawing a line
// that connects each point in the Line.
func (f *Function) Plot(c draw.Canvas, p *plot.Plot) {
	trX, trY := p.Transforms(&c)

	d := (p.X.Max - p.X.Min) / float64(f.Samples-1)
	line := make([]draw.Point, f.Samples)
	for i := range line {
		x := p.X.Min + float64(i)*d
		line[i].X = trX(x)
		line[i].Y = trY(f.F(x))
	}

	// For every continuous block of non-NaN Y values, stroke lines
	for i := 0; i < len(line); i++ {
		if !math.IsNaN(float64(line[i].Y)) {
			j := i + 1
			for ; j < len(line); j++ {
				if math.IsNaN(float64(line[j].Y)) {
					break
				}
			}
			c.StrokeLines(f.LineStyle, c.ClipLinesXY(line[i:j])...)
			i = j
		}
	}
}

示例#21
文件: schema.go 项目: elodina/stack-deploy

// Validate checks whether the given value is writeable to this schema.
func (*NullSchema) Validate(v reflect.Value) bool {
	// Check if the value is something that can be null
	switch v.Kind() {
	case reflect.Interface:
		return v.IsNil()
	case reflect.Array:
		return v.Cap() == 0
	case reflect.Slice:
		return v.IsNil() || v.Cap() == 0
	case reflect.Map:
		return len(v.MapKeys()) == 0
	case reflect.String:
		return len(v.String()) == 0
	case reflect.Float32:
		// Should NaN floats be treated as null?
		return math.IsNaN(v.Float())
	case reflect.Float64:
		// Should NaN floats be treated as null?
		return math.IsNaN(v.Float())
	case reflect.Ptr:
		return v.IsNil()
	case reflect.Invalid:
		return true
	}

	// Nothing else in particular, so this should not validate?
	return false
}

示例#22
文件: datasource_abstract.go 项目: untoldwind/gorrd

func (d *DatasourceAbstract) ProcessPdp(pdpValue float64, elapsed ElapsedPdpSteps, step time.Duration) float64 {
	var preUnknown float64
	if math.IsNaN(pdpValue) {
		preUnknown = elapsed.PreInt
	} else {
		if math.IsNaN(d.PdpValue) {
			d.PdpValue = 0
		}
		d.PdpValue += pdpValue / elapsed.Interval * elapsed.PreInt
	}
	var pdpTemp float64

	if elapsed.Interval > float64(d.Heartbeat) || uint64(step/time.Second/2) < d.UnknownSecCount {
		pdpTemp = math.NaN()
	} else {
		diffPdpSteps := (elapsed.Steps * uint64(step)) / uint64(time.Second)
		pdpTemp = d.PdpValue / (float64(diffPdpSteps-d.UnknownSecCount) - preUnknown)
	}

	if math.IsNaN(pdpValue) {
		d.UnknownSecCount = uint64(elapsed.PostInt)
		d.PdpValue = math.NaN()
	} else {
		d.UnknownSecCount = 0
		d.PdpValue = pdpValue / elapsed.Interval * elapsed.PostInt
	}

	return pdpTemp
}

示例#23
文件: call_iterator.go 项目: oiooj/influxdb

// FloatStddevReduceSlice returns the stddev value within a window.
func FloatStddevReduceSlice(a []FloatPoint) []FloatPoint {
	// If there is only one point then return 0.
	if len(a) < 2 {
		return []FloatPoint{{Time: ZeroTime, Nil: true}}
	}

	// Calculate the mean.
	var mean float64
	var count int
	for _, p := range a {
		if math.IsNaN(p.Value) {
			continue
		}
		count++
		mean += (p.Value - mean) / float64(count)
	}

	// Calculate the variance.
	var variance float64
	for _, p := range a {
		if math.IsNaN(p.Value) {
			continue
		}
		variance += math.Pow(p.Value-mean, 2)
	}
	return []FloatPoint{{
		Time:  ZeroTime,
		Value: math.Sqrt(variance / float64(count-1)),
	}}
}

示例#24
文件: optimizeGrad.go 项目: kortschak/gofunopter

func (u *uniGradStruct) Initialize() error {
	initLoc := u.loc.Init()
	initObj := u.obj.Init()
	initGrad := u.grad.Init()

	// The initial values need to both be NaN or both not nan
	if math.IsNaN(initObj) {
		if !math.IsNaN(initGrad) {
			return errors.New("gofunopter: cubic: initial function value and gradient must either both be set or neither set")
		}
		// Both nan, so compute the initial fuction value and gradient
		initObj, initGrad, err := u.fun.ObjGrad(initLoc)
		if err != nil {
			return errors.New("gofunopter: cubic: error calling function during optimization")
		}
		u.obj.SetInit(initObj)
		u.grad.SetInit(initGrad)
	} else {
		if math.IsNaN(initGrad) {
			return errors.New("gofunopter: cubic: initial function value and gradient must either both be set or neither set")
		}
	}

	err := optimize.Initialize(u.loc, u.obj, u.grad)
	if err != nil {
		return err
	}
	err = u.optimizer.Initialize(u.loc, u.obj, u.grad)
	if err != nil {
		return err
	}
	return nil
}

示例#25
文件: evaluate.go 项目: vozhyk-/gohan

func (self *_runtime) evaluateDivide(left float64, right float64) Value {
	if math.IsNaN(left) || math.IsNaN(right) {
		return NaNValue()
	}
	if math.IsInf(left, 0) && math.IsInf(right, 0) {
		return NaNValue()
	}
	if left == 0 && right == 0 {
		return NaNValue()
	}
	if math.IsInf(left, 0) {
		if math.Signbit(left) == math.Signbit(right) {
			return positiveInfinityValue()
		} else {
			return negativeInfinityValue()
		}
	}
	if math.IsInf(right, 0) {
		if math.Signbit(left) == math.Signbit(right) {
			return positiveZeroValue()
		} else {
			return negativeZeroValue()
		}
	}
	if right == 0 {
		if math.Signbit(left) == math.Signbit(right) {
			return positiveInfinityValue()
		} else {
			return negativeInfinityValue()
		}
	}
	return toValue_float64(left / right)
}

示例#26
文件: histogram.go 项目: phil-mansfield/num

// InitBoundedLog initializes a Histogram instance from the given array
// of values with the given number of bins which fall between the given limits.
// The logarithms of bin centers are uniformly dist. Any
// values outside of these limits are ignored. The returned integer is the
// number of such ignored values. Because of this, infinte and non-positive
// values do not cause a panic.
//
// The first returned value is the initialized Histogram.
//
// InitBoundedLog panics if given a non-positive number of bins or
// a low bound as large or larger than the high bound or if given infinite bounds.
func (hist *Histogram) InitBoundedLog(xs []float64, binNum int, low, high float64) (*Histogram, int) {
	if hist.init {
		panic("stats.Histogram.InitBoundedLog called on initialized struct.")
	} else if binNum < 1 {
		panic(fmt.Sprintf("stats.Histogram.InitBoundedLog given binNum of %d", binNum))
	} else if low >= high || low <= 0 || math.IsInf(low, 0) ||
		math.IsInf(high, 0) || math.IsNaN(low) || math.IsNaN(high) {
		panic(fmt.Sprintf("stats.Histogram.InitBoundedLog given range [%d, %d]", low, high))
	}

	hist.init = true
	hist.Bins = make([]int, binNum)
	hist.BinValues = make([]float64, binNum)
	hist.BinEdges = make([]float64, binNum+1)

	hist.logHistogram = true

	hist.lowLim = math.Log(low)
	hist.highLim = math.Log(high)
	hist.binWidth = (hist.highLim - hist.lowLim) / float64(binNum)

	for i := 0; i < binNum; i++ {
		hist.BinEdges[i] = math.Exp(hist.lowLim + hist.binWidth*float64(i))
		hist.BinValues[i] = math.Exp(hist.lowLim + hist.binWidth*(float64(i)+0.5))
	}

	hist.BinEdges[binNum] = hist.highLim

	return hist, hist.AddArray(xs)
}

示例#27
文件: value.go 项目: Codzart/go-ethereum

func sameValue(x Value, y Value) bool {
	if x.kind != y.kind {
		return false
	}
	result := false
	switch x.kind {
	case valueUndefined, valueNull:
		result = true
	case valueNumber:
		x := x.float64()
		y := y.float64()
		if math.IsNaN(x) && math.IsNaN(y) {
			result = true
		} else {
			result = x == y
			if result && x == 0 {
				// Since +0 != -0
				result = math.Signbit(x) == math.Signbit(y)
			}
		}
	case valueString:
		result = x.string() == y.string()
	case valueBoolean:
		result = x.bool() == y.bool()
	case valueObject:
		result = x._object() == y._object()
	default:
		panic(hereBeDragons())
	}

	return result
}

示例#28
文件: sum_test.go 项目: mingzhi/gomath

func TestSumSpecialValues(t *testing.T) {
	sum := NewSum()
	if !assert.EqualFloat64(0.0, sum.GetResult(), 1e-10, 1) {
		t.Errorf("Sum: result: %f, but expect: %f\n", sum.GetResult(), 0.0)
	}

	sum.Increment(1.0)
	if !assert.EqualFloat64(1.0, sum.GetResult(), 1e-10, 1) {
		t.Errorf("Sum: result: %f, but expect: %f\n", sum.GetResult(), 1.0)
	}

	sum.Increment(math.Inf(0))
	if !assert.EqualFloat64(math.Inf(0), sum.GetResult(), 1e-10, 1) {
		t.Errorf("Sum: result: %f, but expect: %f\n", sum.GetResult(), math.Inf(0))
	}

	sum.Increment(math.Inf(-1))
	if !math.IsNaN(sum.GetResult()) {
		t.Error("Sum: result should be NaN")
	}

	sum.Increment(1.0)
	if !math.IsNaN(sum.GetResult()) {
		t.Error("Sum: result should be NaN")
	}
}

示例#29
文件: number.go 项目: jmptrader/query

func (this floatValue) Collate(other Value) int {
	other = other.unwrap()
	switch other := other.(type) {
	case floatValue:
		if math.IsNaN(float64(other)) {
			if math.IsNaN(float64(this)) {
				return 0
			} else {
				return 1
			}
		}

		result := float64(this - other)
		switch {
		case result < 0.0:
			return -1
		case result > 0.0:
			return 1
		}

		return 0
	default:
		return int(NUMBER - other.Type())
	}

}

示例#30
文件: comparisons.go 项目: connectordb/duck

//Cmp performs a comparison between the two values, and returns the result
//of the comparison (LessThan, GreaterThan, Equals, CantCompare), which are defined as ints
func Cmp(arg1 interface{}, arg2 interface{}) int {
	eq, ok := Equal(arg1, arg2)
	if !ok {
		return CantCompare
	}
	if eq {
		return Equals
	}

	lt, _ := Lt(arg1, arg2)
	if lt {
		return LessThan
	}

	f1, ok := Float(arg1)
	if !ok {
		return CantCompare
	}
	f2, ok := Float(arg2)
	if !ok {
		return CantCompare
	}

	if math.IsNaN(f1) || math.IsNaN(f2) {
		return CantCompare
	}
	return GreaterThan
}

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