updates + tests
This commit is contained in:
parent
1144b80a46
commit
1555902fc4
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@ -7,6 +7,11 @@ import (
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util "github.com/wcharczuk/go-chart/util"
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)
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// Interface Assertions.
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var (
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_ Series = (*AnnotationSeries)(nil)
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)
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// AnnotationSeries is a series of labels on the chart.
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type AnnotationSeries struct {
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Name string
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@ -6,6 +6,11 @@ import (
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"github.com/wcharczuk/go-chart/seq"
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)
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// Interface Assertions.
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var (
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_ Series = (*BollingerBandsSeries)(nil)
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)
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// BollingerBandsSeries draws bollinger bands for an inner series.
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// Bollinger bands are defined by two lines, one at SMA+k*stddev, one at SMA-k*stdev.
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type BollingerBandsSeries struct {
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@ -2,6 +2,13 @@ package chart
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import "fmt"
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// Interface Assertions.
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var (
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_ Series = (*ContinuousSeries)(nil)
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_ FirstValuesProvider = (*ContinuousSeries)(nil)
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_ LastValuesProvider = (*ContinuousSeries)(nil)
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)
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// ContinuousSeries represents a line on a chart.
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type ContinuousSeries struct {
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Name string
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@ -36,6 +43,11 @@ func (cs ContinuousSeries) GetValues(index int) (float64, float64) {
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return cs.XValues[index], cs.YValues[index]
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}
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// GetFirstValues gets the first x,y values.
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func (cs ContinuousSeries) GetFirstValues() (float64, float64) {
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return cs.XValues[0], cs.YValues[0]
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}
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// GetLastValues gets the last x,y values.
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func (cs ContinuousSeries) GetLastValues() (float64, float64) {
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return cs.XValues[len(cs.XValues)-1], cs.YValues[len(cs.YValues)-1]
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@ -7,6 +7,13 @@ const (
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DefaultEMAPeriod = 12
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)
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// Interface Assertions.
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var (
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_ Series = (*EMASeries)(nil)
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_ FirstValuesProvider = (*EMASeries)(nil)
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_ LastValuesProvider = (*EMASeries)(nil)
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)
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// EMASeries is a computed series.
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type EMASeries struct {
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Name string
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@ -66,6 +73,19 @@ func (ema *EMASeries) GetValues(index int) (x, y float64) {
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return
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}
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// GetFirstValues computes the first moving average value.
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func (ema *EMASeries) GetFirstValues() (x, y float64) {
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if ema.InnerSeries == nil {
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return
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}
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if len(ema.cache) == 0 {
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ema.ensureCachedValues()
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}
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x, _ = ema.InnerSeries.GetValues(0)
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y = ema.cache[0]
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return
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}
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// GetLastValues computes the last moving average value but walking back window size samples,
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// and recomputing the last moving average chunk.
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func (ema *EMASeries) GetLastValues() (x, y float64) {
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37
first_value_annotation.go
Normal file
37
first_value_annotation.go
Normal file
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@ -0,0 +1,37 @@
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package chart
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import "fmt"
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// FirstValueAnnotation returns an annotation series of just the first value of a value provider as an annotation.
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func FirstValueAnnotation(innerSeries ValuesProvider, vfs ...ValueFormatter) AnnotationSeries {
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var vf ValueFormatter
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if len(vfs) > 0 {
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vf = vfs[0]
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} else if typed, isTyped := innerSeries.(ValueFormatterProvider); isTyped {
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_, vf = typed.GetValueFormatters()
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} else {
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vf = FloatValueFormatter
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}
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var firstValue Value2
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if typed, isTyped := innerSeries.(FirstValuesProvider); isTyped {
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firstValue.XValue, firstValue.YValue = typed.GetFirstValues()
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firstValue.Label = vf(firstValue.YValue)
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} else {
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firstValue.XValue, firstValue.YValue = innerSeries.GetValues(0)
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firstValue.Label = vf(firstValue.YValue)
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}
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var seriesName string
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var seriesStyle Style
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if typed, isTyped := innerSeries.(Series); isTyped {
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seriesName = fmt.Sprintf("%s - First Value", typed.GetName())
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seriesStyle = typed.GetStyle()
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}
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return AnnotationSeries{
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Name: seriesName,
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Style: seriesStyle,
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Annotations: []Value2{firstValue},
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}
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}
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22
first_value_annotation_test.go
Normal file
22
first_value_annotation_test.go
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@ -0,0 +1,22 @@
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package chart
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import (
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"testing"
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"github.com/blend/go-sdk/assert"
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)
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func TestFirstValueAnnotation(t *testing.T) {
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assert := assert.New(t)
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series := ContinuousSeries{
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XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
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YValues: []float64{5.0, 3.0, 3.0, 2.0, 1.0},
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}
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fva := FirstValueAnnotation(series)
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assert.NotEmpty(fva.Annotations)
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fvaa := fva.Annotations[0]
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assert.Equal(1, fvaa.XValue)
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assert.Equal(5, fvaa.YValue)
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}
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22
last_value_annotation_test.go
Normal file
22
last_value_annotation_test.go
Normal file
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@ -0,0 +1,22 @@
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package chart
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import (
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"testing"
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"github.com/blend/go-sdk/assert"
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)
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func TestLastValueAnnotation(t *testing.T) {
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assert := assert.New(t)
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series := ContinuousSeries{
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XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
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YValues: []float64{5.0, 3.0, 3.0, 2.0, 1.0},
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}
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lva := LastValueAnnotation(series)
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assert.NotEmpty(lva.Annotations)
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lvaa := lva.Annotations[0]
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assert.Equal(5, lvaa.XValue)
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assert.Equal(1, lvaa.YValue)
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}
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@ -7,6 +7,13 @@ import (
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util "github.com/wcharczuk/go-chart/util"
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)
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// Interface Assertions.
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var (
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_ Series = (*LinearRegressionSeries)(nil)
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_ FirstValuesProvider = (*LinearRegressionSeries)(nil)
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_ LastValuesProvider = (*LinearRegressionSeries)(nil)
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)
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// LinearRegressionSeries is a series that plots the n-nearest neighbors
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// linear regression for the values.
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type LinearRegressionSeries struct {
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@ -82,6 +89,19 @@ func (lrs *LinearRegressionSeries) GetValues(index int) (x, y float64) {
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return
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}
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// GetFirstValues computes the first linear regression value.
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func (lrs *LinearRegressionSeries) GetFirstValues() (x, y float64) {
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if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
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return
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}
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if lrs.m == 0 && lrs.b == 0 {
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lrs.computeCoefficients()
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}
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x, y = lrs.InnerSeries.GetValues(0)
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y = (lrs.m * lrs.normalize(x)) + lrs.b
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return
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}
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// GetLastValues computes the last linear regression value.
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func (lrs *LinearRegressionSeries) GetLastValues() (x, y float64) {
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if lrs.InnerSeries == nil || lrs.InnerSeries.Len() == 0 {
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@ -8,6 +8,13 @@ import (
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util "github.com/wcharczuk/go-chart/util"
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)
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// Interface Assertions.
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var (
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_ Series = (*PolynomialRegressionSeries)(nil)
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_ FirstValuesProvider = (*PolynomialRegressionSeries)(nil)
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_ LastValuesProvider = (*PolynomialRegressionSeries)(nil)
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)
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// PolynomialRegressionSeries implements a polynomial regression over a given
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// inner series.
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type PolynomialRegressionSeries struct {
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@ -101,6 +108,23 @@ func (prs *PolynomialRegressionSeries) GetValues(index int) (x, y float64) {
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return
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}
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// GetFirstValues computes the first poly regression value.
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func (prs *PolynomialRegressionSeries) GetFirstValues() (x, y float64) {
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if prs.InnerSeries == nil || prs.InnerSeries.Len() == 0 {
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return
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}
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if prs.coeffs == nil {
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coeffs, err := prs.computeCoefficients()
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if err != nil {
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panic(err)
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}
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prs.coeffs = coeffs
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}
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x, y = prs.InnerSeries.GetValues(0)
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y = prs.apply(x)
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return
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}
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// GetLastValues computes the last poly regression value.
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func (prs *PolynomialRegressionSeries) GetLastValues() (x, y float64) {
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if prs.InnerSeries == nil || prs.InnerSeries.Len() == 0 {
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@ -11,6 +11,13 @@ const (
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DefaultSimpleMovingAveragePeriod = 16
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)
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// Interface Assertions.
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var (
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_ Series = (*SMASeries)(nil)
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_ FirstValuesProvider = (*SMASeries)(nil)
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_ LastValuesProvider = (*SMASeries)(nil)
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)
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// SMASeries is a computed series.
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type SMASeries struct {
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Name string
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@ -63,6 +70,17 @@ func (sma SMASeries) GetValues(index int) (x, y float64) {
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return
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}
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// GetFirstValues computes the first moving average value.
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func (sma SMASeries) GetFirstValues() (x, y float64) {
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if sma.InnerSeries == nil || sma.InnerSeries.Len() == 0 {
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return
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}
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px, _ := sma.InnerSeries.GetValues(0)
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x = px
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y = sma.getAverage(0)
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return
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}
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// GetLastValues computes the last moving average value but walking back window size samples,
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// and recomputing the last moving average chunk.
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func (sma SMASeries) GetLastValues() (x, y float64) {
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@ -7,6 +7,14 @@ import (
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util "github.com/wcharczuk/go-chart/util"
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)
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// Interface Assertions.
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var (
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_ Series = (*TimeSeries)(nil)
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_ FirstValuesProvider = (*TimeSeries)(nil)
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_ LastValuesProvider = (*TimeSeries)(nil)
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_ ValueFormatterProvider = (*TimeSeries)(nil)
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)
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// TimeSeries is a line on a chart.
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type TimeSeries struct {
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Name string
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@ -33,14 +41,21 @@ func (ts TimeSeries) Len() int {
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return len(ts.XValues)
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}
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// GetValues gets a value at a given index.
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// GetValues gets x, y values at a given index.
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func (ts TimeSeries) GetValues(index int) (x, y float64) {
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x = util.Time.ToFloat64(ts.XValues[index])
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y = ts.YValues[index]
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return
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}
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// GetLastValues gets the last value.
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// GetFirstValues gets the first values.
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func (ts TimeSeries) GetFirstValues() (x, y float64) {
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x = util.Time.ToFloat64(ts.XValues[0])
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y = ts.YValues[0]
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return
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}
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// GetLastValues gets the last values.
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func (ts TimeSeries) GetLastValues() (x, y float64) {
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x = util.Time.ToFloat64(ts.XValues[len(ts.XValues)-1])
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y = ts.YValues[len(ts.YValues)-1]
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@ -14,6 +14,11 @@ type BoundedValuesProvider interface {
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GetBoundedValues(index int) (x, y1, y2 float64)
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}
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// FirstValuesProvider is a special type of value provider that can return it's (potentially computed) first value.
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type FirstValuesProvider interface {
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GetFirstValues() (x, y float64)
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}
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// LastValuesProvider is a special type of value provider that can return it's (potentially computed) last value.
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type LastValuesProvider interface {
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GetLastValues() (x, y float64)
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