/src/main/java/net/finmath/interpolation/RationalFunctionInterpolation.java
intervalIndex = intervalIndex;
intervalIndex = 0;
if(intervalIndex < 0) { if(extrapolationMethod == ExtrapolationMethod.CONSTANT) { return values[0]; } else if(extrapolationMethod == ExtrapolationMethod.LINEAR) { return values[0]+(values[1]-values[0])/(points[1]-points[0])*(x-points[0]); } else { <extra_id_0> } } else if(intervalIndex > points.length-2) { if(extrapolationMethod == ExtrapolationMethod.CONSTANT) { return values[points.length-1]; } else if(extrapolationMethod == ExtrapolationMethod.LINEAR) {