ähmm, are you sure you have looked at
2.control.examples/16.more.arrays.pd ?as far as i can tell the "bounds" message is exactly what you are looking for.
oops, I'm sorry. that's exactly what I wanted. I knew that I had done
something with that, and I didn't remembered anymore. and I did looked at
both array help patches, but it wasn't enough.
the only weird thing is the order of arguments: [bounds <Xmin> <Ymax> <Xmax> <Ymin>( (i guess this is due to the constant turning the graph upside down: if your origin is the upper-left corner of the screen, you will have [bounds <Xmin> <Ymin> <Xmax> <Ymax>(, but unfortunately we are so used to having the Y-axis pointing upwards)
so:
[bounds 0 128 100 0( | [s array]