[Haskell-beginners] How to write replicateM with interspersed guards?

[Sebastien Zany]

Just realized I used "f" twice, make the outer one something else.

On Tue, Oct 4, 2011 at 5:27 AM, Sebastien Zany <
sebastien at chaoticresearch.com> wrote:

> What would be the idiomatic way to write a function which expands to the
> following?
>
> f n m = do {
> x1 <- m;
> guard (f [x1]);
> x2 <- m;
> guard (f [x1, x2]);
> .
> .
> .
> xn <- m;
> guard (f [x1,x2,...,xn]);
> }
>
> What I'm trying to do is generate a list of lists of length n with some
> property (checked by f) efficiently.
>
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