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 Antibase Two #:  _ 1 0 Antibase

 #: y is the binary representation of y , and is equivalent to (m#2)#:y , where m is the maximum of the number of digits needed to represent the atoms of y in base 2 . For example: ``` i. 8 0 1 2 3 4 5 6 7 #: i. 8 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 ``` In simple cases r&#: is inverse to r&#. . Thus: ``` r=: 24 60 60 r #: r #. 2 3 4 2 3 4 ``` But if r #. y exceeds (*/r)-1 (the largest integer representable in the radix r), then the result of r#:y is reduced modulo */r . For example: ``` r #: r #. 29 3 4 5 3 4 ```

A representation in an arbitrary base that is analogous to the base-2 representation provided by the monadic use of #: may be provided as illustrated below:
```   ndr=: 1 + <.@^.             Number of digits required

10 ndr y=: 9 10 11 100 99 100
1 2 2 3 2 3

(y#:~10 #~ >./10 ndr y);(y#:~8 #~ >./8 ndr y)
+-----+-----+
|0 0 9|0 1 1|
|0 1 0|0 1 2|
|0 1 1|0 1 3|
|1 0 0|1 4 4|
|0 9 9|1 4 3|
|1 0 0|1 4 4|
+-----+-----+

(10&#.^:_1 ; 8&#.^:_1) y
+-----+-----+
|0 0 9|0 1 1|
|0 1 0|0 1 2|
|0 1 1|0 1 3|
|1 0 0|1 4 4|
|0 9 9|1 4 3|
|1 0 0|1 4 4|
+-----+-----+
```

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