Matrix z(x,y) charts

[Víctor de Buen Remiro]

A matrix can be viewd as a function z(x,y), and so it would be a great help to analysis a tool that allows show some of these cross XY charts over a matrix

-Boolean chart: a black pixel or rectangle for each non null cell z(x,y)==0 and a white one for null cells, z(x,y)!=0.

-Topographic chart: The same idea of boolean but extended to a scale of grays or other colours for each interval of values. This scale which could be customizable or automatic. Intervals could be defined as any combination of left and right closed or open pairs (a,b), [a,b), (a,b] or [a,b]; where first left is allways -Inf and last right values is allways +Inf. Note that a Boolean chart is a special case of this one with just three ranges:

(-Inf, 0) -> Black,
[ 0, 0] -> White,
( 0, +Inf) -> Black

-3D charts: Using simple bars or interpolated surfaces instead of plain topographic could be a good feature sometimes to represent z(x,y). In this case the first row and column could be optionally interpreted as X,Y axes scaling.