From fc1d2eb7920c3940991069399c5fd2c3db49736c Mon Sep 17 00:00:00 2001
From: Dimitri Lozeve <dimitri@lozeve.com>
Date: Sun, 23 Feb 2020 22:18:10 +0100
Subject: [PATCH] Fix constraint to allow empty cells

---
 src/optim.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/optim.jl b/src/optim.jl
index 0f65f89..340f3ed 100644
--- a/src/optim.jl
+++ b/src/optim.jl
@@ -51,7 +51,7 @@ function definemodel(plantcounts::Vector, mask::Matrix, costs::Matrix)
     )
 
     for i = 1:N
-        @constraint(model, sum(x[i, q] for q = 1:Q) == 1)
+        @constraint(model, sum(x[i, q] for q = 1:Q) <= 1)
         if mask[i] == 0
             for q = 1:Q
                 @constraint(model, x[i, q] == 0)