74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package seq
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// Range returns the array values of a linear seq with a given start, end and optional step.
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func Range(start, end float64) []float64 {
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return Seq{NewLinear().WithStart(start).WithEnd(end).WithStep(1.0)}.Array()
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}
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// RangeWithStep returns the array values of a linear seq with a given start, end and optional step.
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func RangeWithStep(start, end, step float64) []float64 {
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return Seq{NewLinear().WithStart(start).WithEnd(end).WithStep(step)}.Array()
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}
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// NewLinear returns a new linear generator.
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func NewLinear() *Linear {
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return &Linear{step: 1.0}
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}
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// Linear is a stepwise generator.
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type Linear struct {
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start float64
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end float64
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step float64
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}
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// Start returns the start value.
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func (lg Linear) Start() float64 {
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return lg.start
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}
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// End returns the end value.
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func (lg Linear) End() float64 {
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return lg.end
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}
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// Step returns the step value.
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func (lg Linear) Step() float64 {
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return lg.step
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}
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// Len returns the number of elements in the seq.
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func (lg Linear) Len() int {
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if lg.start < lg.end {
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return int((lg.end-lg.start)/lg.step) + 1
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}
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return int((lg.start-lg.end)/lg.step) + 1
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}
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// GetValue returns the value at a given index.
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func (lg Linear) GetValue(index int) float64 {
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fi := float64(index)
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if lg.start < lg.end {
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return lg.start + (fi * lg.step)
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}
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return lg.start - (fi * lg.step)
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}
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// WithStart sets the start and returns the linear generator.
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func (lg *Linear) WithStart(start float64) *Linear {
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lg.start = start
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return lg
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}
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// WithEnd sets the end and returns the linear generator.
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func (lg *Linear) WithEnd(end float64) *Linear {
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lg.end = end
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return lg
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}
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// WithStep sets the step and returns the linear generator.
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func (lg *Linear) WithStep(step float64) *Linear {
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lg.step = step
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return lg
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}
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