Report non-basic variables in Layout::LinearProgram as having zero value

diff --git a/source/layout.cpp b/source/layout.cpp
index 74b33f0bce1933de385720eed1eabe6e821956b2..2972ec8567829a9faabe9caa7d7ab09733a26914 100644 (file)
--- a/source/layout.cpp
+++ b/source/layout.cpp
@@ -365,8 +365,10 @@ float Layout::LinearProgram::get_variable(unsigned i)
        if(i+1>=n_columns)
                throw out_of_range("LinearProgram::get_variable");
 
-       unsigned r = columns[i].basic;
-       return columns.back().values[r];
+       if(unsigned r = columns[i].basic)
+               return columns.back().values[r];
+       else
+               return 0;
 }
 
 bool Layout::LinearProgram::solve()