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For each positive element of Y the corresponding element of R is an integer, pseudo-randomly selected from the integers ⍳Y with each integer in this population having an equal chance of being selected.
For each zero element of Y, the corresponding element of R is a pseudo-random floating-point value in the range 0 - 1, but excluding 0 and 1, i.e. (0<R[I]<1).
⎕IO and ⎕RL are implicit arguments of Roll. A side effect of Roll is to change the value of ⎕RL.
Note that different random number generators are available; see ⎕RL for more information.
?9 9 9 2 7 5 ?3⍴0 0.3205466592 0.3772891947 0.5456603511