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(PECL trader >= 0.2.2)
trader_set_unstable_period — Set unstable period
$functionId 
   ,  integer $timePeriod 
   )Influences unstable period factor for functions, which are sensible to it. More information about unstable periods can be found on the » TA-Lib API documentation page.
functionId Function ID the factor should be set for. TRADER_FUNC_UNST_* constant series can be used to affect the corresponding function.
timePeriod Unstable period value.
没有返回值。