[PD] querying for the size of an array?

[David Merrill]

Hello -
Is there a way to query the size of an array? I'm playing samples from 
arrays, and I've discovered the -resize flag to the "read" message that 
I give to soundfiler which allows the array to change size dynamically 
to match the wav file. Now I'm interested in formulating my message to 
tabread4 dynamically, depending on the size of the array.
much appreciated,
David Merrill