Function calcPositions

test/jasmine/tests/histogram_test.js:849–851

(opts, extraTraces, prepend)

        });

        function calcPositions(opts, extraTraces, prepend) {
            return _calc(opts, extraTraces, {}, prepend).map(function(v) { return v.p; });
        }

        it('harmonizes autobins when all traces are autobinned', function() {
            var trace1 = {x: [1, 2, 3, 4]};