[Bug-apl] APL fill elements

[Peter Teeson]

Is there a nice way to set the fill element for arrays?
Right now it's 0 for numeric and ' ' for character.

Because my function, that is deliberately ⎕IO agnostic, produces an m by n 
array of different length vectors as a result of using X←(⊂matrix)foo¨matrix. 
These vectors are certain indices into the original matrix This is precisely 
what I want.

However in ⊃X each vector is filled with 0 - which, when ⎕IO is also 0, is also 
a legitimate index. And I don't want that. 

I suppose I could set ⎕IO locally but it doesn't appeal to my sense of elegance 
- although it would be practical! Sigh!

So it would be nice to allow me to set the fill element to something other than 
the default values.

Comments?

respect….

Peter