public void Acos()
{
// arrange
var targetData = new double[3];
var srcData = new double[] { -1.0, 0, 1.0 };
var target = new DataAndLayout <double>(targetData, new FastAccess(new Layout(new int[] { 3 }, 0, new int[] { 1 })));
var src = new DataAndLayout <double>(srcData, new FastAccess(new Layout(new int[] { 3 }, 0, new int[] { 1 })));
// action
ScalarOps.Acos(target, src);
// assert
const double Epsilon = 1e-8;
Assert.IsTrue(Math.Abs(targetData[0] - Math.PI) < Epsilon);
Assert.IsTrue(Math.Abs(targetData[1] - (Math.PI / 2.0)) < Epsilon);
Assert.IsTrue(Math.Abs(targetData[2] - 0.0) < Epsilon);
}