[R] seqN

[Paul Gilbert]

 I have  been using a function

seqN <- function(N) {if (0==length(N)) NULL else if (N<=0) NULL else seq(N)}

in for loops when I want no looping in the case of a zero value:

for (i in seqN(m) ) ...

Since seqN(0) returns NULL this results in for doing no loops (which is much
more convenient than always checking for m==0). It seems that a function like
this should be defined in R (and S) but I have never found it. Is there an
already defined function that does this (or a better way to achieve this
result)?

Paul Gilbert

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