Simplify LINQ to Create Step Values Assume the following definition:

public class DataPoint {
    public DateTime Date { get; private set; }
    public double Value { get; private set; }
    public DataPoint(DateTime date, double value) { Date = date; Value = value; }
}


If var points = ... //a date ordered list of DataPoints

I want to convert points into a list or array that represents the steps between each subsequent value. E.g. [3, 5, 6, 10.5] would go to [3, 2, 1, 4.5] with dates.

Here's what I have:

var steps = (new[] {points.First()})
              .Concat(points
                        .Skip(1)
                        .Zip(points, 
                            (curr, prev) =&gt; new DataPoint(curr.Date, curr.Value - prev.Value)))


I think my ruby background might have gotten the best of me as that doesn't seem very readable. Any thoughts on how to make things more approachable?
In my opinion, the Concat part is what's throwing it off. There is a lesser utilized Select overload that provides access to the index, which could be used like so (ignoring the DataPoint part to make a minimal example):

double[] points = new double[] { 3, 5, 6, 10.5 };

points.Select ((p, i) =&gt; p - (i == 0 ? 0 : points[i - 1]));