if (dataset == null) {
throw new IllegalArgumentException("Null 'dataset' argument.");
}
if (dataset instanceof RangeInfo) {
RangeInfo info = (RangeInfo) dataset;
return new Double(info.getRangeLowerBound(true));
}
// hasn't implemented RangeInfo, so we'll have to iterate...
else {
double minimum = Double.POSITIVE_INFINITY;