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Calculation script using data from previous entries

Question asked by beano129 on Feb 19, 2013
Latest reply on Feb 20, 2013 by philmodjunk

Title

Calculation script using data from previous entries

Post

     Hi all, 

     Right i've got a table for logging kms for a company car. 

     Each time the person logs somthing new he's adding the date and the reading of the odometer. 

     I want to perform a calculation per entry that will subtract the odometer reading from the previous entry from the reading on the current entry to give a total distance travelled. 

     I can't seem to find a scrip that will allow me to subtract values from previous entries from within the same field. 

     I'm sure this will probably be pretty simple! 

     Thanks all (Probably Phil) 

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