Request: Suggestions for "good teaching" packages, esp. with C code

On 16/02/2011 7:04 a.m., Paul Johnson wrote:

...

4. We don't want gratuitous use of "return" at the end of functions.
Why do people still do that?

Well I for one (and Jeff as well it seems) think it is good 
programming practice. It makes explicit what is being returned 
eliminating the possibility of mistakes and provides clarity for 
anyone reading the code.

David Scott

AFAIR (but I am not sure, maybe some expert can comment on this), there 
is a difference between using return and not using return when R code is 
called from C-code via eval(). If my memory is correct, a return() 
statement (in the R code) would abort the C function (which is trying to 
evaluate the R code, e.g., the body of a function) as well, which is 
probably not intended. So, the use of return() in R code may be quite 
disadvantageous in certain situations.

Martin

Dr. Martin Becker
Statistics and Econometrics
Saarland University
Campus C3 1, Room 217
66123 Saarbruecken
Germany