Question

Given two arrays:

double[] a = new double[]{1.0, 2.0, 3.0};
bool[] b = new bool[]{true, false, true};

Is there an easy way to select in a based on b? In R and other scripting languages you would say:

a[b]

to get {1.0, 3.0}. I can not figure out if there is a clean (no explicit loops involved) way to do this in C#. Maybe I should organise my data differently?

Answer 1

You can achieve this using LINQ:

double[] a = new double[]{1.0, 2.0, 3.0}; 
bool[] b = new bool[]{true, false, true}; 
var result = a.Where((item, index)=>b[index]);