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    Stan Math Library
    5.1.0
    
   Automatic Differentiation 
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  inline | 
Return the sample standard deviation of a variable which inherits from EigenBase.
Return the sample standard deviation of the var_value matrix.
| T | Input type | 
| [in] | x | input | 
| domain | error size is not greater than zero. | 
| T | Input type | 
| [in] | x | input matrix | 
| domain | error size is not greater than zero. |