html, body, #container {

    width: 100%;

    height: 100%;

    margin: 0;

    padding: 0;

}

    anychart.onDocumentReady(function () {

var dataTable = anychart.data.table();

dataTable.addData(get_dji_daily_short_data());

​

var mapping = dataTable.mapAs({value: 1});

​

var chart = anychart.stock();

​

var indicator = dataTable.createComputer(mapping);

indicator.addOutputField('customField', 'uid');

indicator.setContext({period: 2000, queue: 257});

​

// Set initial function.

indicator.setStartFunction(function(context) {

    context.period *= 2;

});

indicator.setCalculationFunction(function(row) {

    row.set('customField', row.get('value') + this.period);

});

​

var indicatorMapping = dataTable.mapAs({value: 'uid'});

​

var plot = chart.plot();

plot.column(mapping);

plot.line(indicatorMapping);

plot.getSeries(1).name('Custom indicator');

​

chart.title('Set initial function');

chart.container('container');

chart.draw();

});