Raster value sum to 1

Discussion created by catrionalbrogan on Feb 21, 2012
Can anyone help me.  I'm using arc 10 and I am looking to compare multiple raster data sets but I need each raster data set to sum to one.  I have been told to multiply the row, column and mean values of the raster set together.  I was then told to divide the original raster by the number generated from this calculation, but so far the new maps that are generated do not have a value of one.  Can anyone advise me.
Many thanks