Initiates the calculation of density. This routine sets the function Pointer for density calcualtion and calls the generice get Value of Index routine
The interface has to comply to the abstract interface tem_varSys_proc_getValOfIndex.
Type  Intent  Optional  Attributes  Name  

class(tem_varSys_op_type),  intent(in)  ::  fun  Description of the method to obtain the variables, here some preset values might be stored, like the space time function to use or the required variables. 

type(tem_varSys_type),  intent(in)  ::  varSys  The variable system to obtain the variable from. 

type(tem_time_type),  intent(in)  ::  time  Point in time at which to evaluate the variable. 

integer,  intent(in)  ::  iLevel  Level on which values are requested 

integer,  intent(in)  ::  idx(:)  Index of points in the growing array and variable val array to return. Size: most times nVals, if contiguous arrays are used it depends on the number of first indices 

integer,  intent(in),  optional  ::  idxLen(:)  With idx as start index in contiguous memory, idxLength defines length of each contiguous memory Size: dependes on number of first index for contiguous array, but the sum of all idxLen is equal to nVals 

integer,  intent(in)  ::  nVals  Number of values to obtain for this variable (vectorized access). 

real(kind=rk),  intent(out)  ::  res(:)  Resulting values for the requested variable. Dimension: n requested entries x nComponents of this variable Access: (iElem1)*fun%nComponents + iComp 
Type  Visibility  Attributes  Name  Initial  

procedure(mus_derive_fromPDF),  private,  pointer  ::  fnCalcPtr  Function pointer to perform specific operation. 