Is there an (elegant) way to define a min/max lambda expression?
public class MathFunction{
private java.util.function.Function <double[], Double> function = null;
public MathFunction ( Function <double[], Double> pFunction ){
this.function = pFunction;
}
}
// now defining a min-function...
MathFunction func = new MathFunction((x) -> min(x));
Of course min(x) does not work. I need a way to sort an array "on the fly".
You could stream the array and extract the min from it:
MathFunction func =
new MathFunction((x) -> Arrays.stream(x).min().getAsDouble());
Arrays.stream but did not know about that .getAsDouble(). Thank you very much.
Arrays.stream(x).summaryStatistics() from which you can pull getMin() and getMax() and so only traversing the ayrray once.
min does. For large arrays this may be a noticeable difference.min would still have to perform a complete pass of the array. If you need both min and max (as OP seems to) the this trick would ensure one pass and deliver both at once.min, though, it's a shame to have to calculate a bunch of other things.