From 7810a212265e01d3f24d9b24350233bd4b4f2a35 Mon Sep 17 00:00:00 2001
From: Brett <brettmaster1@gmail.com>
Date: Sun, 21 Jul 2024 23:23:50 -0400
Subject: [PATCH] fix fitness proportinate

---
 CMakeLists.txt    |  4 ++--
 src/selection.cpp | 15 ++++++++++-----
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23de5e5..e685b9b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.0.95)
+project(blt-gp VERSION 0.0.96)
 
 include(CTest)
 
@@ -87,7 +87,7 @@ endmacro()
 
 if (${BUILD_EXAMPLES})
 
-    blt_add_project(blt-SR-playground examples/symbolic_regression.cpp example)
+    blt_add_project(blt-symbolic-regression examples/symbolic_regression.cpp example)
 
 endif ()
 
diff --git a/src/selection.cpp b/src/selection.cpp
index 779cb5e..34343ed 100644
--- a/src/selection.cpp
+++ b/src/selection.cpp
@@ -80,12 +80,17 @@ namespace blt::gp
     tree_t& select_fitness_proportionate_t::select(gp_program& program, population_t& pop, population_stats& stats)
     {
         auto choice = program.get_random().get_double();
-        for (const auto& ind : blt::enumerate(pop))
+        for (const auto& [index, ref] : blt::enumerate(pop))
         {
-            if (ind.first == 0 && choice <= stats.normalized_fitness[ind.first])
-                return ind.second.tree;
-            if (choice > stats.normalized_fitness[ind.first - 1] && choice <= stats.normalized_fitness[ind.first])
-                return ind.second.tree;
+            if (index == 0)
+            {
+                if (choice <= stats.normalized_fitness[index])
+                    return ref.tree;
+            } else
+            {
+                if (choice > stats.normalized_fitness[index - 1] && choice <= stats.normalized_fitness[index])
+                    return ref.tree;
+            }
         }
         BLT_WARN("Unable to find individual with fitness proportionate. This should not be a possible code path! (%lf)", choice);
         return pop.get_individuals()[0].tree;