Toshinari Kamakura wrote:
>I would like to know subtotals in the specified intervals.

I believe this will work:

           sbt =: I.&|. +//. ]

Example:

           ] Y =: 20 (?.%]) 100
        0.46 0.99 0.23 0.62 0.42 0.44 0.12 0.05 0.68 0.63 0.76 0.84 0.53 0.83 
0.69 0.97 0.74 0.82 0.1 0.79

           X =: 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1   NB.  Original 
intervals

           X sbt Y
        1.71 1.82 1.03 0.52 2.78 0.05 0.53 2.45 0.82

-Dan
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