LocalLimit

Library "LocalLimit"
Calculates the local upper or local lower limit for a given series. Applying multiple passes produces what appears like support or resistance levels.
See Local Limits for more detail.

upper(src) Produces the recent local upper limit for a given series.
  Parameters:
    src: The source series to derive from.

lower(src) Produces the recent local lower limit for a given series.
  Parameters:
    src: The source series to derive from.

版本注释:

v2 Added option for padding.

Updated:
upper(src, padding) Produces the recent local upper limit for a given series.
  Parameters:
    src: The source series to derive from.
    padding: Gives some extra room when lowering the level.

lower(src, padding) Produces the recent local lower limit for a given series.
  Parameters:
    src: The source series to derive from.
    padding: Gives some extra room when raising the level.

版本注释:

v3 Fixed issue with na padding causing nothing to show.

版本注释:

v4 Handle NA values.

版本注释:

v5 Restored previous demo code. Added trend function.

版本注释:

v6 added trend function (missing export).

Added:
trend(src) Determines the local trend of a series that and persists the trend if the value is unchanged.
  Parameters:
    src: The source series to derive from.
@return +1 when the trend is up; -1 when the trend is down; 0 if the trend is not yet established.

版本注释:

v7

Added:
valueAndTrend(src)
  Creates a Limit object that contains the value and the trend.
  Parameters:
    src: The source series to derive from.

of(level, padding)
  Creates a Level object representing the local upper and lower limits.
  Parameters:
    level: The source levels to expand of.
    padding: Gives some extra room when raising the lower level and lowering the upper level.

Limit
  Fields:
    value
    trend

Level
  Fields:
    upper
    lower