Mansfield relative strength

describe_indicator("Mansfield Relative Strength", 'lower', { decimals: 3, shortName: 'RSM', mainColorInheritFrom: 'line'});
const indexSymbol = input.symbol('Index');
const dLength = input.number('Daily length', 200, { min: 1 });
const wLength = input.number('Weekly length', 52, { min: 1 });
const mLength = input.number('Monthly length', 10, { min: 1 });
const oLength = input.number('Other periods length', 52, { min: 1 });
let length;
switch(constants.resolution) {
    case 'D':
        length = dLength;
        break;
    case 'W':
        length = wLength;
        break;
    case 'M':
        length = mLength;
        break;
    default:
        length = oLength;
}
const maType = input('MA type', 'sma', constants.ma_types);
// get a reference to the MA math, according to user's choice in maType input
const computeMA = indicators[maType];
// Convert current resolution to a higher one that contains at least double the amount of candles
const higherResolution = { 1: '2', 2: '4', 3: '6', 4: '10', 5: '10', 6: '12', 10: '30', 12: '30', 15: '30', 30: '60',
                         45: '90', 60: '120', 65: '240', 90: '240', 120: '240', 240: '1440', 1440: 'D', D: 'W',
                         W: 'M', M: 'Q', Q: 'Y', Y: 'Y' }[constants.resolution];
const indexData = await request.history(indexSymbol, higherResolution, {
    ext_session: current.is_ext_hours
});
const indexClose = land_points_onto_series(indexData.time, indexData.close, time, 'ge');
// Set last close as a latest value to avoid missing points due to not yet finalized higher timeframe candle
const lastClose = interpolate_sparse_series(indexClose, 'constant')[close.length - 1];
indexClose[close.length - 1] = lastClose;
const rsd = mult(div(close, interpolate_sparse_series(indexClose, 'constant')), 100);
const rsdMa = computeMA(rsd, length);
const rsm = mult(sub(div(rsd, rsdMa), 1), 100);
paint(rsm, 'Line', '#1e5879');
const zeroLine = horizontal_line(0);
paint(zeroLine, 'Zero', '#2595f3', 'dotted');
color_cloud(rsm, zeroLine, '#9fe2dc', '#ffb2b0');