From 7b7d37d66c93a8c085dcee9371344bcb0a2e464b Mon Sep 17 00:00:00 2001
From: zhanxw <zhanxw@gmail.com>
Date: Fri, 22 Apr 2016 00:29:33 -0500
Subject: [PATCH] fix a bug

---
 src/DataLoader.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/DataLoader.cpp b/src/DataLoader.cpp
index 5029d18..8032f0f 100644
--- a/src/DataLoader.cpp
+++ b/src/DataLoader.cpp
@@ -254,7 +254,8 @@ int DataLoader::loadCovariate(const std::string& covar,
  */
 int DataLoader::arrangeCovariate(const std::vector<std::string>& names,
                                  std::vector<std::string>* droppedNames) {
-  if (covariate.ncol() > 0) {
+  if (covariate.nrow() > 0) {
+    // when covariates are used
     covariate.keepRow(phenotype.getRowName());
     covariate.reorderRow(phenotype.getRowName());
     assert(covariate.nrow() == phenotype.nrow());