Create a lower triangular marix from input array.  
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Create a lower triangular marix from input array. 
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- Parameters
 - 
  
    | [out] | out | is the lower traingle matrix  | 
    | [in] | in | is the input matrix  | 
    | [in] | is_unit_diag | is a boolean parameter specifying if the diagonal elements should be 1  | 
  
   
 
 
      
        
          | AFAPI array af::lower  | 
          ( | 
          const array &  | 
          in,  | 
        
        
           | 
           | 
          bool  | 
          is_unit_diag = false  | 
        
        
           | 
          ) | 
           |  | 
        
      
 
- Parameters
 - 
  
    | [in] | in | is the input matrix  | 
    | [in] | is_unit_diag | is a boolean parameter specifying if the diagonal elements should be 1  | 
  
   
- Returns
 - the lower triangle array 
 
- Examples: 
 - lin_algebra/lu.cpp.