From: Keith G. <kwg...@gm...> - 2006-09-21 03:47:03
NaN adds a lot of whitespace in the representation of a matrix.
Without NaN:
matrix([[1, 2],
[3, 4]])
With NaN:
matrix([[ nan, 2. ],
[ 3. , 4. ]])
There's enough room for the wikipedia entry for nan.