func (lg LinearSeq) Start() float64 {
	return lg.start
}
Start returns the start value.
package chart
func LinearRange(start, end float64) []float64 {
	return Seq{NewLinearSequence().WithStart(start).WithEnd(end).WithStep(1.0)}.Values()
}
func LinearRangeWithStep(start, end, step float64) []float64 {
	return Seq{NewLinearSequence().WithStart(start).WithEnd(end).WithStep(step)}.Values()
}
func NewLinearSequence() *LinearSeq {
	return &LinearSeq{step: 1.0}
}
type LinearSeq struct {
	start float64
	end   float64
	step  float64
}