Averaging AtoD samples

[HankMcSpank]

ok, so scalerobotic's link to Melanie's 'sorting numbers' article, is exactly what I need, so I'm trying to get the thing to work.

i've basically got a small array that a prepopulate with some random numbers.

@ __CONFIG _FCMEN_OFF & _HS_OSC & _WDT_OFF & _MCLRE_OFF & _CP_OFF & _IESO_OFF & _BOR_OFF & _PWRTE_OFF

DEFINE  OSC 20          ' set Oscillator at 20Mhz.
DEFINE  NO_CLRWDT 1   ' PBP doesn't clear WDT automatically
DEFINE HSER_CLROERR 1
DEFINE HSER_TXSTA 24h ' Enable transmit
DEFINE HSER_SPBRG 129 ' set USART to 9600 baud  @20Mhz

    CounterA var Byte
    DataA var Byte
    RawData var Byte [6]
    Averaged var byte
    hserout [27,91,72]          'home cursor
    hserout [27,91,50,74]       'clear screen
    
    RawData[0]  = 25
    RawData[1]  = 27
    RawData[2]  = 32
    RawData[3]  = 30
    RawData[4]  = 34
    RawData[5]  = 33

    
    hserout ["before....", 13, 10]
    hserout [dec rawdata[0],13,10]
    hserout [dec rawdata[1],13,10]
    hserout [dec rawdata[2],13,10]
    hserout [dec rawdata[3],13,10]
    hserout [dec rawdata[4],13,10]
    hserout [dec rawdata[5],13,10]
    hserout [13,10]
    hserout [13,10]


    CounterA =0
    gosub SortArray
    gosub Average_data
    hserout ["after....", 13, 10]
    hserout [dec rawdata[0],13,10]
    hserout [dec rawdata[1],13,10]
    hserout [dec rawdata[2],13,10]
    hserout [dec rawdata[3],13,10]
    hserout [dec rawdata[4],13,10]
    hserout [dec rawdata[5],13,10]

    hserout ["averaged = ", dec averaged,13,10]
    goto end1
    
    
Average_data:
    hserout [dec rawData[2]," + ", dec rawData[3], 13,10]
    Averaged = (rawData[2]+rawData[3])/2    ' average the middle two of 6 ongoing samples
    return

SortArray:
SortLoop:
    If RawData(CounterA+1) < RawData(CounterA) then
        DataA=RawData(CounterA)
        RawData(CounterA)=RawData(CounterA+1)
        RawData(CounterA+1+0)=DataA
        If CounterA > 0 then CounterA=CounterA-2
        endif
    CounterA=CounterA+1
    If CounterA < 5 then goto SortLoop
    Return

    end1:
    end

here's my screen output (I average the middle two numbers Rawdata[2] & RawData[3] )....

before....
25
27
32
30
34
33

after....
6
25
27
30
32
33
averaged = 31

It all works (ie sorts & averages correctly) - but where on earth has the number 6 in the sorted numbers come from? (there was no number six in the original array - also, whatever number I place in that array position RawData[4] comes out sorted as 6!?!!)

Edit: Ok, think I've stumbled on the issue - it seems to be related to my array declaration ....because when I use RawData var Byte [8] ...everything works.

So why can't I declare an array 5 bytes 'deep'? ie RawData var byte [5] ???