The quick and helpful answers I get from this list encourage me to ask more questions. I hope that is OK.
In my mental model of how things work, I imagine a J array to be stored as a fixed size header (or a header of size that is a function of the array rank) followed by the array contents. According to 7!:5, my floating point array seems to take up more space that that. This in on 32-bit Windows. $rater_sig02 480189 19 8**/$rater_sig02 72988728 7!:5 <'rater_sig02' 134217728 (7!:5 <'rater_sig02')%*/$rater_sig02 14.7111 In addition to just intellectual curiosity, my practical question is whether I need to think about anything beyond the number of elements and the type of my array when creating a mapped file to contain it. -Michael =============== Michael J. A. Berry Data Miners, Inc. +1 617 742 4252 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
