Retaining a value from a previous record

In writing a graph to cleanse a data file (.csv), I need to be able to replace an invalid value in a field with the value from the equivalent field in the previous record. Can someone tell me how to do this, please?

Hi,

see my answer to the original question viewtopic.php?t=6727

Cool, thanks. Couldn’t see the original post so thought it had fallen down the back of the sofa… :smiley: