ei_test.go

// Copyright (c) 2018, Jack Parkinson. All rights reserved.
// Use of this source code is governed by the BSD 3-Clause
// license that can be found in the LICENSE file.

package special_test

import (
	"testing"

	. "scientificgo.org/special"
	"scientificgo.org/testutil"
)

var casesEi = []struct {
	Label   string
	In, Out float64
}{
	{"", nan, nan},
	{"", 750, +inf},
	{"", +inf, +inf},
	{"", -inf, 0},
	{"", 0, -inf},
	{"", 1e-05, -10.935699800043695},
	{"", 1e-10, -22.448635264938925},
	{"", 0.01, -4.017929465426669},
	{"", 1, 1.8951178163559368},
	{"", 2, 4.95423435600189},
	{"", 5, 40.18527535580318},
	{"", 6, 85.9897621424392},
	{"", 6.01, 86.66495316518093},
	{"", 7.5, 289.3883982001446},
	{"", 8, 440.37989953483816},
	{"", 9, 1037.8782907170896},
	{"", 10, 2492.2289762418777},
	{"", 10.00001, 2492.251002806792},
	{"", 15, 234955.8524907683},
	{"", 20, 2.5615652664056588e+07},
	{"", 25, 3.0059509065255485e+09},
	{"", 27.5, 3.3153303643324104e+10},
	{"", 29.99, 3.654282129023645e+11},
	{"", 30, 3.689732094072742e+11},
	{"", 35, 4.669055014466159e+13},
	{"", 40, 6.039718263611242e+15},
	{"", 45, 7.943916035704454e+17},
	{"", 50, 1.058563689713169e+20},
	{"", 100, 2.71555274485388e+41},
	{"", 200, 3.6312352331593567e+84},
	{"", 705, 2.138148975687854e+303},
	{"", 716, 1.2605029106040893e+308},
	{"", -1e-100, -229.68129363450305},
	{"", -1e-10, -22.448635265138925},
	{"", -1e-05, -10.935719800043696},
	{"", -0.01, -4.037929576538114},
	{"", -1, -0.21938393439552029},
	{"", -2, -0.04890051070806112},
	{"", -4, -0.0037793524098489067},
	{"", -4.0000001, -0.0037793519519579615},
	{"", -5, -0.0011482955912753257},
	{"", -6, -0.0003600824521626587},
	{"", -7, -0.00011548173161033822},
	{"", -8, -3.76656228439249e-05},
	{"", -9, -1.2447354178006272e-05},
	{"", -10, -4.156968929685325e-06},
	{"", -11, -1.4003003042474418e-06},
	{"", -12, -4.7510818246724936e-07},
	{"", -13, -1.6218662188014328e-07},
	{"", -14, -5.5656311111451816e-08},
	{"", -15, -1.918627892147867e-08},
	{"", -20, -9.835525290649882e-11},
	{"", -30, -3.0215520106888124e-15},
	{"", -50, -3.783264029550459e-24},
	{"", -100.5, -2.2232069135926296e-46},
	{"", -105.5, -1.427644740730669e-48},
	{"", -500, -1.4220767822536383e-220},
	{"", -700, -1.406518766234033e-307},
}

func TestEi(t *testing.T) {
	testutil.Test(t, tol, casesEi, Ei)
}

/*
func BenchmarkEi(b *testing.B) {
	GlobalF = bench(b, cEi, "",
		func(x []float64) float64 {
			return Ei(x[0])
		})
}
*/