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| You can use patterns efficiently or not. Just like anything else. The only difference is that it is easier to construct inefficient patterns for users with less experience, which is why I generally suggest to avoid pattern-matching in... |
| You can still do that, if you want. In such case you will have to put `List` around the match for `__h` on the r.h.s. For example, total[elems___Integer]:= Total[{elems}] But this would really mean taking a sequence as an argument, not a... |
| It's a useful example, but to fully understand it, one needs to also understand the non-standard evaluation process and how garbage collection works, so it is by no means trivial. I would say that it illustrates some advanced uses of these constructs... |
| The issue of RLink's incompatibility with R3.x is being worked on, and the fix is coming. You may expect it to appear in one of the following point releases. In the mean time, I will post any updates (such as if some temporary patches become... |