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Base Two #.  1 1 1 Base

#.y is the base-2 value of y, that is, 2#.y . For example:
   #. 1 0 1 0
10

   #. 2 3$ 0 0 1,1 0 1
1 5
  x#.y is a weighted sum of the items of y ; that is, +/w*y , where w is the product scan */\.}.x,1 . An atomic argument is reshaped to the shape of the other argument.
 

   ]a=: i. 3 4
0 1  2  3
4 5  6  7
8 9 10 11

   10 #.a
123 4567 9011

   8 #. a
83 2423 4763

   ]time=: 0 1 3,1 1 3,:2 4 6
0 1 3
1 1 3
2 4 6

   x=: 24 60 60
   x #. time
63 3663 7446

   x,1
24 60 60 1

   ]w=: */\.}. x,1
3600 60 1

   w *"1 time
   0  60 3
3600  60 3
7200 240 6

   +/"1 w *"1 time
63 3663 7446

   w +/@:* "1 time
63 3663 7446

   c=: 3 1 4 2 [ y=: 0 1 2 3 4 5
   c p. y                    Polynomial with coefficients c
3 10 37 96 199 358

   y #."0 1 |.c
3 10 37 96 199 358


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