Below is a sample method to obtain from an array of numbers and array values in a percentile range.

//Declare Variables and Parameters C_POINTER($1;$2) C_LONGINT($3;$4;$size;$lowPos;$highPos;$counter) C_REAL($lowPer;$highPer) ARRAY LONGINT($arrayIn;0) ARRAY LONGINT($arrayRes;0) If (Count parameters=4)  If($3<$4)   $size:=Size of array($1->) //Calculate Range of values   $lowPer:=$3/100   $highPer:=$4/100   $lowPos:=($lowPer*$size)+1   $highPos:=$highPer*$size   COPY ARRAY($1->;$arrayIn)   SORT ARRAY($arrayIn) //Generate Array of values within percentile   For ($counter;$lowPos;$highPos)    APPEND TO ARRAY($arrayRes;$arrayIn{$counter})   End for   COPY ARRAY($arrayRes;$2->)  End if End if

Saving the method as Array_Percentile, an example using the method is shown below.

//Declare Variables ARRAY LONGINT($array;60) C_LONGINT($counter) ARRAY LONGINT($arrayRes1;0) ARRAY LONGINT($arrayRes2;0) ARRAY LONGINT($arrayRes3;0) //Generate sample data For ($counter;1;60)  $array{$counter}:=Mod(Random;100) End for Array_Percentile(->$array;->$arrayRes1;0;10) Array_Percentile(->$array;->$arrayRes2;25;100) Array_Percentile(->$array;->$arrayRes3;25;75)

The method above will result in the following:
-$arrayRes1 will contain the lower 10th percentile of values in $array
-$arrayRes2 will contain the upper 25th percentile of values in $array
-$arrayRes3 will contain the middle 50th percentile of values in $array which contains values greater than the lower 25th percentile and values lower than the upper 75th percentile.