added sum

src/tools/collapse_dataset_tool.js

-morpheus.CollapseDatasetTool = function() {
+morpheus.CollapseDatasetTool = function () {
 };
-morpheus.CollapseDatasetTool.Functions = [ morpheus.Mean, morpheus.Median,
-		new morpheus.MaxPercentiles([ 25, 75 ]), morpheus.Min, morpheus.Max ];
-morpheus.CollapseDatasetTool.Functions.fromString = function(s) {
+morpheus.CollapseDatasetTool.Functions = [morpheus.Mean, morpheus.Median,
+	new morpheus.MaxPercentiles([25, 75]), morpheus.Min, morpheus.Max, morpheus.Sum];
+morpheus.CollapseDatasetTool.Functions.fromString = function (s) {
 	for (var i = 0; i < morpheus.CollapseDatasetTool.Functions.length; i++) {
 		if (morpheus.CollapseDatasetTool.Functions[i].toString() === s) {
 			return morpheus.CollapseDatasetTool.Functions[i];
@@ -11,41 +11,41 @@ morpheus.CollapseDatasetTool.Functions.fromString = function(s) {
 	throw new Error(s + ' not found');
 };
 morpheus.CollapseDatasetTool.prototype = {
-	toString : function() {
+	toString: function () {
 		return 'Collapse';
 	},
-	init : function(project, form) {
-		var setValue = function(val) {
+	init: function (project, form) {
+		var setValue = function (val) {
 			var isRows = val === 'Rows';
 			var names = morpheus.MetadataUtil.getMetadataNames(isRows ? project
 			.getFullDataset().getRowMetadata() : project
 			.getFullDataset().getColumnMetadata());
 			form.setOptions('collapse_to_fields', names);
 		};
-		form.$form.find('[name=collapse]').on('change', function(e) {
+		form.$form.find('[name=collapse]').on('change', function (e) {
 			setValue($(this).val());
 		});
 		setValue('Rows');
 	},
-	gui : function() {
-		return [ {
-			name : 'collapse_method',
-			options : morpheus.CollapseDatasetTool.Functions,
-			value : morpheus.CollapseDatasetTool.Functions[1].toString(),
-			type : 'select'
+	gui: function () {
+		return [{
+			name: 'collapse_method',
+			options: morpheus.CollapseDatasetTool.Functions,
+			value: morpheus.CollapseDatasetTool.Functions[1].toString(),
+			type: 'select'
 		}, {
-			name : 'collapse',
-			options : [ 'Columns', 'Rows' ],
-			value : 'Rows',
-			type : 'radio'
+			name: 'collapse',
+			options: ['Columns', 'Rows'],
+			value: 'Rows',
+			type: 'radio'
 		}, {
-			name : 'collapse_to_fields',
-			options : [],
-			type : 'select',
-			multiple : true
-		} ];
+			name: 'collapse_to_fields',
+			options: [],
+			type: 'select',
+			multiple: true
+		}];
 	},
-	execute : function(options) {
+	execute: function (options) {
 		var project = options.project;
 		var controller = options.controller;
 		var f = morpheus.CollapseDatasetTool.Functions
@@ -66,14 +66,14 @@ morpheus.CollapseDatasetTool.prototype = {
 			dataset = dataset.getDataset();
 		}
 		var set = new morpheus.Map();
-		_.each(allFields, function(field) {
+		_.each(allFields, function (field) {
 			set.set(field, true);
 		});
-		_.each(collapseToFields, function(field) {
+		_.each(collapseToFields, function (field) {
 			set.remove(field);
 		});
 		// hide fields that were not part of collapse to
-		set.forEach(function(val, name) {
+		set.forEach(function (val, name) {
 			controller.setTrackVisible(name, false, !rows);
 		});
 		project.setFullDataset(dataset, true);