Here are the images to compare with the results of the four function tables.
The plus and times tables determine the domain for subtraction and division.
It is 0 to 20 for the left argument of subtraction and 0 to 100 for
division.
In the images the smallest numbers are black and the numbers range from dark
to light colors. The largest numbers are whit.
load 'viewmat'
GRB=:1 0 2{"1 (#:i.8){0 255
PTD=:+/~i.11
MTD=:(i.21)-/i.11
TTD=:*/~i.11
DTD=:(i.101)%/>:i.9x
DTDreal=:(i.101)%/>:i.9
DTD-:DTDreal-:DTD
GRB viewmat PTD
GRB viewmat MTD
GRB viewmat TTD
GRB viewmat DDT
Linda
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