arrays
Array * array = matrix
matrix diagonal extraction
Some of these definitions would be easier if I add array pop here first, instead of later
add standard deviation brak
*show*
v1 = ( [1][2][3] . . . ) :: array def ([][][]...)
v1 s[1] :: array ref v1 s[1]
([v_20][v_20][v_20]) + 1 :: ops across all elements of array
sum( _20 v_25 ) :: sum(), count( _20 v_25 ) :: count(), avg( _20 v_25 ) :: avg()
prod([1][2][3]) :: prod([1][2][3])
expo([1][2][3]) :: expo([1][2][3])