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test case for large angles in trig functions
R=rsc https://golang.org/cl/157160
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@ -169,6 +169,7 @@ func tolerance(a, b, e float64) bool {
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}
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return d < e;
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}
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func kindaclose(a, b float64) bool { return tolerance(a, b, 1e-8) }
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func close(a, b float64) bool { return tolerance(a, b, 1e-14) }
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func veryclose(a, b float64) bool { return tolerance(a, b, 4e-16) }
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@ -274,6 +275,42 @@ func TestHypot(t *testing.T) {
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}
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}
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// Check that math functions of high angle values
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// return similar results to low angle values
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func TestLargeSin(t *testing.T) {
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large := float64(100000 * Pi);
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for i := 0; i < len(vf); i++ {
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f1 := Sin(vf[i]);
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f2 := Sin(vf[i] + large);
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if !kindaclose(f1, f2) {
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t.Errorf("Sin(%g) = %g, want %g\n", vf[i]+large, f1, f2)
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}
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}
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}
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func TestLargeCos(t *testing.T) {
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large := float64(100000 * Pi);
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for i := 0; i < len(vf); i++ {
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f1 := Cos(vf[i]);
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f2 := Cos(vf[i] + large);
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if !kindaclose(f1, f2) {
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t.Errorf("Cos(%g) = %g, want %g\n", vf[i]+large, f1, f2)
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}
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}
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}
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func TestLargeTan(t *testing.T) {
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large := float64(100000 * Pi);
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for i := 0; i < len(vf); i++ {
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f1 := Tan(vf[i]);
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f2 := Tan(vf[i] + large);
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if !kindaclose(f1, f2) {
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t.Errorf("Tan(%g) = %g, want %g\n", vf[i]+large, f1, f2)
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}
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}
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}
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// Check that math constants are accepted by compiler
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// and have right value (assumes strconv.Atof works).
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// http://code.google.com/p/go/issues/detail?id=201
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