Function evaluateExpression

Fold the legs into one synthetic series.

legs maps each symbol in expr.symbols to its bars. A symbol with no entry, or a bar the primary has and a leg does not, yields no output bar: the series gaps there rather than carrying a stale price forward, because a ratio against yesterday's close is a number that was never true.

const e = parseExpression('NIFTY1!/NSE:RELIANCE');
const bars = evaluateExpression(e, { 'NIFTY1!': a, 'NSE:RELIANCE': b });
chart.addSeries('line').setData(bars);
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Volume is absent by default. Opt into volume: 'sum' to report the combined activity of the matched legs, independently of the price expression. Open interest is always absent: an expression has no single contract position.