# trader_set_unstable_period

(PECL trader >= 0.2.2)

trader_set_unstable_period — Set unstable period

### Description

trader_set_unstable_period ( int `$functionId` , int `$timePeriod` ) : void

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.

### Parameters

`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.

### Return Values

No value is returned.