diff --git a/src/ui/heat_map.js b/src/ui/heat_map.js
index 6ca69e3af1040db69c0ba0cbb763e7c4a0473f96..641096cc7b6ef9aa934fd82713486627410f3a38 100644
--- a/src/ui/heat_map.js
+++ b/src/ui/heat_map.js
@@ -1029,13 +1029,13 @@ morpheus.HeatMap.prototype = {
 					columnIndex)));
 				rowTracks.forEach(function (track) {
 					tipText.push('\t');
-					tipText.push(morpheus.Util.formatObject(dataset
+					tipText.push(morpheus.Util.toString(dataset
 					.getRowMetadata().getByName(track.name).getValue(
 						rowIndex)));
 				});
 				columnTracks.forEach(function (track) {
 					tipText.push('\t');
-					tipText.push(morpheus.Util.formatObject(dataset
+					tipText.push(morpheus.Util.toString(dataset
 					.getColumnMetadata().getByName(track.name)
 					.getValue(columnIndex)));
 				});
diff --git a/src/ui/heat_map_tooltip_provider.js b/src/ui/heat_map_tooltip_provider.js
index c737e325a05cf715e8a299af6eb884d26dbd9f9a..c9f8ab0f62a1a2de474101702f56d91ed5e0f5fb 100644
--- a/src/ui/heat_map_tooltip_provider.js
+++ b/src/ui/heat_map_tooltip_provider.js
@@ -143,7 +143,7 @@ morpheus.HeatMapTooltipProvider._matrixValueToString = function (dataset,
 			var obj = val.toObject ? val.toObject() : val;
 			var keys = _.keys(obj);
 			if (keys.length === 0) {
-				var v = morpheus.Util.formatObject(obj);
+				var v = morpheus.Util.toString(obj);
 				if (tipText.length > 0) {
 					tipText.push(separator);
 				}
@@ -163,7 +163,7 @@ morpheus.HeatMapTooltipProvider._matrixValueToString = function (dataset,
 						if (morpheus.Util.isArray(objVal)) {
 							v = morpheus.Util.arrayToString(objVal, ', ');
 						} else {
-							v = morpheus.Util.formatObject(objVal);
+							v = morpheus.Util.toString(objVal);
 						}
 						if (tipText.length > 0) {
 							tipText.push(separator);
@@ -214,13 +214,13 @@ morpheus.HeatMapTooltipProvider.vectorToString = function (vector, index,
 						}
 						tipText.push(key);
 						tipText.push(': <b>');
-						tipText.push(morpheus.Util.formatObject(subVal));
+						tipText.push(morpheus.Util.toString(subVal));
 						tipText.push('</b>');
 					}
 				});
 			} else {
 				tipText.push(': <b>');
-				tipText.push(morpheus.Util.formatObject(arrayVal));
+				tipText.push(morpheus.Util.toString(arrayVal));
 				tipText.push('</b>');
 			}
 
@@ -271,7 +271,7 @@ morpheus.HeatMapTooltipProvider.vectorToString = function (vector, index,
 				}
 				tipText.push(vector.getName());
 				tipText.push(': <b>');
-				tipText.push(morpheus.Util.formatObject(primaryVal));
+				tipText.push(morpheus.Util.toString(primaryVal));
 				tipText.push('</b>');
 			}
 
@@ -319,10 +319,10 @@ morpheus.HeatMapTooltipProvider._nodesToString = function (tipText, nodes,
 					if (i > 0) {
 						tipText.push(', ');
 					}
-					tipText.push(morpheus.Util.formatObject(value[i]));
+					tipText.push(morpheus.Util.toString(value[i]));
 				}
 			} else {
-				tipText.push(morpheus.Util.formatObject(value));
+				tipText.push(morpheus.Util.toString(value));
 			}
 			tipText.push('</b>');
 			if (color) {
diff --git a/src/util/util.js b/src/util/util.js
index c81d786db1eb4eb6ea7998acbfb02dd914a7123a..b9fbb7c7b6c62b3a7c1b2a424a883f722354adfc 100644
--- a/src/util/util.js
+++ b/src/util/util.js
@@ -961,20 +961,6 @@ morpheus.Util.createNumberFormat = function (nfractionDigits) {
 	};
 	return f;
 };
-morpheus.Util.formatObject = function (value) {
-	if (_.isNumber(value)) {
-		return morpheus.Util.nf(value);
-	}
-	return value;
-};
-morpheus.Util.arrayToString = function (array, sep) {
-	var s = [];
-	for (var i = 0, length = array.length; i < length; i++) {
-		s.push(morpheus.Util.formatObject(array[i]));
-	}
-	return s.join(sep);
-
-};
 
 morpheus.Util.wrapNumber = function (value, object) {
 	var n = new Number(value);
@@ -989,14 +975,25 @@ morpheus.Util.toString = function (value) {
 	} else if (_.isNumber(value)) {
 		return morpheus.Util.nf(value);
 	} else if (morpheus.Util.isArray(value)) {
-		var s = [];
-		for (var i = 0, length = value.length; i < length; i++) {
-			s.push(morpheus.Util.formatObject(value[i]));
-		}
-		return s.join(', ');
+		return morpheus.Util.arrayToString(value, ', ');
 	}
 	return '' + value;
 };
+
+morpheus.Util.arrayToString = function (value, sep) {
+	var s = [];
+	for (var i = 0, length = value.length; i < length; i++) {
+		var val_i = value[i];
+		if (_.isNumber(val_i)) {
+			s.push(morpheus.Util.nf(val_i[i]));
+		} else {
+			s.push('' + val_i);
+		}
+
+	}
+	return s.join(sep);
+
+};
 morpheus.Util.removeTrailingZerosInFraction = function (str) {
 	var index = str.lastIndexOf('.');
 	if (index !== -1) {