hey so for a physics project im going to make a thermophysics simulator. my backend is going to be apl. ill use a 2d array of temperatures to represent a grid of temperatures. i want to change the temperature of tiles adjacent to tiles with differing temperatures. the quad diamond comes to mind.
({⊂⍵}⌺3 3) 3 3⍴⍳9
this gives me a nested array of adjacent tiles. im wondering how i can make the border values default to something else than 0, because i want 0 to be a possible temperature in the array. having the border values be something other than 0 which is outside of the domain of temperatu…