Hi,

I'm having a little problem understanding this (from Viktor Cerovski's  
solution):

>
>   diffdig =: *./@~:@(#.^:_1)


Why is a scalar left argument sufficient in this case

       (10&#.^:_1) 123
1 2 3

but when I omit the power adverb and use the inverse function directly  
I need a vector to get the same result?

      10#:123
3
       10 10 10#:123
1 2 3

Isn't  #:^:_1 the same as #. since they are inverse functions?

Rudi





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