[PD] [list /], [list -]?

[stephaniebrodeur at rogers.com]

Hello all, 
 
We are working on getting values from an image to a pd 
array. We are using maxlib's [tabset] to write the values 
to an array but the values are ints ranging from 0-255 and 
we'd like to get floats from -1 to 1. Since gridflow deals 
only with ints currently, are operations on lists possible 
in pd? 
 
Thank you, 
 
Alexandre and Stephanie