[gradsusr] Subtract previous value

[Chorley Weather]

Hi all, 

This is probably an easy solution but if I have 96 hours worth of
precipitation data but I need to subtract the previous value for an
hourly output how would I go about this? For example hour 2 would need
to subtract hour 1, then hour 3 would need to subtract hour 2 and so
on...... 

Thanks in advance!!! 
-- 

Stuart Markham 

 
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