Function moreDates

src/plots/cartesian/axis_autotype.js:62–82

(a, calendar)

// numbers and a few dates
// as with categories, consider DISTINCT values only.
function moreDates(a, calendar) {
    var len = a.length;

    var inc = getIncrement(len);
    var dats = 0;
    var nums = 0;
    var seen = {};

    for(var f = 0; f < len; f += inc) {
        var i = round(f);
        var ai = a[i];
        var stri = String(ai);
        if(seen[stri]) continue;
        seen[stri] = 1;

        if(isDateTime(ai, calendar)) dats++;
        if(isNumeric(ai)) nums++;
    }

    return dats > nums * 2;
}

// return increment to test at most 1000 points, evenly spaced
function getIncrement(len) {