hep: go-hep.org/x/hep/sliceop/f64s Index | Examples | Files

package f64s

import "go-hep.org/x/hep/sliceop/f64s"

Package f64s provides common operations on float64 slices.

Index

Examples

Package Files

f64s.go

func Filter Uses

func Filter(dst, src []float64, f func(v float64) bool) []float64

Filter creates a slice with all the elements x_i of src for which f(x_i) is true. Filter uses dst as work buffer, storing elements at the start of the slice. Filter clears dst if a slice is passed, and allocates a new slice if dst is nil.

An example of slice filtering

Code:

slice := []float64{1, 2, -99, 4, 5, -99, 7}
condition := func(x float64) bool { return x > 0 }
fmt.Println(f64s.Filter(nil, slice, condition))

Output:

[1 2 4 5 7]

func Find Uses

func Find(dst []int, src []float64, f func(v float64) bool) []int

Find creates a slice with all indices corresponding to elements for which f(x) is true. Find uses dst as work buffer, storing indices at the start of the slice. Find clears dst if a slice is passed, and allocates a new slice if dst is nil.

An example of slice finding

Code:

slice := []float64{1, 2, -99, 4, 5, -99, 7}
condition := func(x float64) bool { return x == -99 }
fmt.Println(f64s.Find(nil, slice, condition))

Output:

[2 5]

func Map Uses

func Map(dst, src []float64, f func(v float64) float64) []float64

Map creates a slice with all the elements f(x_i) where x_i are elements from src. Map uses dst as work buffer, storing elements at the start of the slice. Map allocates a new slice if dst is nil. Map will panic if the lengths of src and dst differ.

An example of slice mapping

Code:

slice := []float64{1, 2, -99, 4, 5, -99, 7}
operation := func(x float64) float64 { return x * x }
fmt.Println(f64s.Map(nil, slice, operation))

Output:

[1 4 9801 16 25 9801 49]

func Take Uses

func Take(dst, src []float64, indices []int) []float64

Take creates a sub-slice of src with all elements indiced by the provided indices. Take uses dst as work buffer, storing elements at the start of the slice. Take clears dst if a slice is passed, and allocates a new slice if dst is nil. Take will panic if indices is not sorted or has duplicates. Take will panic if length of indices is larger than length of src. Take will panic if length of indices is different from length of dst.

An example of taking a sub-slice defined by indices

Code:

slice := []float64{1, 2, -99, 4, 5, -99, 7}
indices := []int{2, 5}
fmt.Println(f64s.Take(nil, slice, indices))

Output:

[-99 -99]

Package f64s imports 1 packages (graph). Updated 2020-05-26. Refresh now. Tools for package owners.