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8D. Arithmetic
d0=: [: >: #: | Add 1 to cyclic counter y with upper limit x |
d1=: +//. | Sum items of y corresponding to keys x |
d2=: +//. {~ 'abcde'"_ i. ~.@[ | Sum y according to keys x from key set 'abcde'. (substitute your ordered keyset for 'abcde') |
d3=: +. | Greatest common divisor of x and y |
m4=: >:@i.@(>./) |/ ] | 1 thru max y residues of y |
m5=: 0: = m4 | Locate positive integers <: y dividing y |
d6=: +"1 | Add x to each row of y |
d7=: + | Add list x to each column of table y |
d8=: + | Add list y to each column of table x |
d9=: *. | Least common multiple of x and y |