The default periods (a third of the history, up to ~33k) bypassed
MAX_PERIODS, and each forecast row's three ETS formulas refit over the whole
history, so 100k history rows x 10k periods froze the app. History is now at
most 10,000 rows, periods at most 10,000, and history x periods at most
500,000 (about 3 us per history point per fit: a few seconds of recalc at
the cap). The default is clamped to the cap; explicit periods or an end past
it are refused.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
New sheet before the active one with the sorted history, a FORECAST.ETS
forecast column, FORECAST.ETS.CONFINT lower/upper bounds, an optional
FORECAST.ETS.STAT table, an Excel table over the data and a line or column
chart. Parameters: timeline/values (default: the selection's first two
columns), end or periods, confidence interval, seasonality, missing-point
fill, duplicate aggregation, statistics, chart kind. Data ribbon button
opens a form dialog; programmatic calls never do. gridcraft-functions
exports Timeline to continue a timeline (numeric step or calendar months).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brandon Thomas
vangel76