From 874a5066eb88c889e3117f219c245eb9712e14a0 Mon Sep 17 00:00:00 2001
From: Jakob Bossek <info@jakobbossek.de>
Date: Tue, 17 Feb 2015 23:44:04 +0100
Subject: [PATCH] fix #55

---
 R/generateOffspring.R | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/R/generateOffspring.R b/R/generateOffspring.R
index de3ecf5..4f89db9 100644
--- a/R/generateOffspring.R
+++ b/R/generateOffspring.R
@@ -41,6 +41,10 @@ simpleUniformSelection = function(matingPool) {
   population = matingPool$individuals
   fitness = matingPool$fitness
   n = nrow(population)
-    idx = sample(n, size = 2, replace = FALSE)
+  # if we have only one individual, return it twice
+  if (n == 1) {
+    return(makePopulation(population[c(1, 1), , drop = FALSE], fitness[c(1, 1)]))
+  }
+  idx = sample(n, size = 2, replace = FALSE)
   makePopulation(population[idx, , drop = FALSE], fitness[idx])
 }