High-Frequency Momentum Indicator (MI)

Query intraday minute-bar MI (Momentum Index) for A-share securities via the market data service.A = close - close_N (raw momentum); B = MA(A, N) (smoothed).Default: N=12.line selects output: 'A' (raw momentum) or 'B' (MA-smoothed).codes: comma-separated security codes (e.g. '600000.SH,000001.SZ').interval: minute bar width — 1/3/5/10/15/30/60.starttime/endtime: 'YYYY-MM-DD HH: MM: SS' intraday range.