README.md

fnplot

Package fnplot provides a way to plot input/output values for arbitrary functions on a 2D cartesian coordinate plot. The input/output values are converted to scalar values (arbitrary precision floating point) in a way that attempts to preserve the relative scale of the original values.

Examples

Numeric Functions

Plot the math.Sin function between 0 and 100 on the X axis.

import (
    "math"
    "github.com/matthewdale/fnplot"
)

func main() {
    err := fnplot.FnPlot{
		Fn: fnplot.NewFn(
			math.Sin,
			2000,
			fnplot.Float64Range(0, 100),
		),
		Title: "math.Sin",
		X:     &fnplot.StdAxix{},
		Y:     &fnplot.StdAxix{},
	}.Save("sin.png")

    if err != nil {
        panic(err)
    }
}

Byte Functions

Plot the md5.Sum function using a natural log X axis and scaled Y axis.

import (
    "crypto/md5"
    "github.com/matthewdale/fnplot"
)

func main() {
    err := fnplot.FnPlot{
		Fn: fnplot.NewFn(
			func(s string) [md5.Size]byte {
				return md5.Sum([]byte(s))
			},
			2000,
			fnplot.AnyString()),
		Title: "md5.Sum",
		X:     &fnplot.LnAxis{},
		Y:     &fnplot.ScaledAxis{Max: 1000},
	}.Save("md5.png")

    if err != nil {
        panic(err)
    }
}