diff --git a/openbr/core/eigenutils.cpp b/openbr/core/eigenutils.cpp
new file mode 100644
index 0000000..ce75b65
--- /dev/null
+++ b/openbr/core/eigenutils.cpp
@@ -0,0 +1,19 @@
+#include "eigenutils.h"
+#include <openbr/openbr_plugin.h>
+
+using namespace Eigen;
+using namespace cv;
+
+//Helper function to quickly write eigen matrix to disk. Not efficient.
+void writeEigen(MatrixXf X, QString filename) {
+    Mat m(X.rows(),X.cols(),CV_32FC1);
+    for (int i = 0; i < X.rows(); i++) {
+        for (int j = 0; j < X.cols(); j++) {
+            m.at<float>(i,j) = X(i,j);
+        }
+    }
+    QScopedPointer<br::Format> format(br::Factory<br::Format>::make(filename));
+    format->write(br::Template(m));
+}
+
+