To avoid confusion upfront: The problem set drop box is now open and all registered students (Gov2001,Gov1002,E2001) should be able to submit their code for the homework through this venue at: http://isites.harvard.edu/icb/icb.do?keyword=k28616&pageid=icb.page1261… The submission deadline is this Thursday 5 PM. If for some reason you don't have access to the dropbox please submit directly to both TFs via email. Thanks, Jens

Ok let me clarify: Yes PS 0 is ungraded so nothing bad will happen if you don't submit anything. But in general we would like students (esp. those who don't have any background in R) to submit their code so we can take a look and get a sense of how well you cope with the coding. Solutions will be posted so you can check your work. The first official problem set will be handed out and posted this Thursday. Jens From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Bay, Kelly Sent: Tuesday, February 12, 2008 8:54 AM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] homework submission: dropbox Just to clarify: This week's problem set #0 is optional and ungraded, correct? (It says that solutions will be posted on the website, so I was confused why we need to turn it in to the drop box...) Won't the first graded problem set be handed out this Thursday, the 14th and be due by 5PM next Thursday, the 21st? Thanks! _____________________________________ Kelly Bay Brown University Department of Political Science Kelly_Bay at brown.edu _____ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of Jens Hainmueller Sent: Tue 2/12/2008 8:30 AM To: gov2001-l at lists.fas.harvard.edu Subject: [gov2001-l] homework submission: dropbox To avoid confusion upfront: The problem set drop box is now open and all registered students (Gov2001,Gov1002,E2001) should be able to submit their code for the homework through this venue at: http://isites.harvard.edu/icb/icb.do?keyword=k28616 <http://isites.harvard.edu/icb/icb.do?keyword=k28616&pageid=icb.page126127> &pageid=icb.page126127 The submission deadline is this Thursday 5 PM. If for some reason you don't have access to the dropbox please submit directly to both TFs via email. Thanks, Jens _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Yes. PS 0 is due tomorrow. From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Joerg Orgeldinger Sent: Wednesday, February 13, 2008 6:49 AM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] homework submission: dropbox Dear Jens, but I hope I got it right- The problem set 0 is due to tomorrow? Jens Hainmueller <jhainmueller at gmail.com> schrieb: Ok let me clarify: Yes PS 0 is ungraded so nothing bad will happen if you don't submit anything. But in general we would like students (esp. those who don't have any background in R) to submit their code so we can take a look and get a sense of how well you cope with the coding. Solutions will be posted so you can check your work. The first official problem set will be handed out and posted this Thursday. Jens From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Bay, Kelly Sent: Tuesday, February 12, 2008 8:54 AM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] homework submission: dropbox Just to clarify: This week's problem set #0 is optional and ungraded, correct? (It says that solutions will be posted on the website, so I was confused why we need to turn it in to the drop box...) Won't the first graded problem set be handed out this Thursday, the 14th and be due by 5PM next Thursday, the 21st? Thanks! _____________________________________ Kelly Bay Brown University Department of Political Science Kelly_Bay at brown.edu _____ From: gov2001-l-bounces at lists.fas.harvard.edu on behalf of Jens Hainmueller Sent: Tue 2/12/2008 8:30 AM To: gov2001-l at lists.fas.harvard.edu Subject: [gov2001-l] homework submission: dropbox To avoid confusion upfront: The problem set drop box is now open and all registered students (Gov2001,Gov1002,E2001) should be able to submit their code for the homework through this venue at: http://isites.harvard.edu/icb/icb.do?keyword=k28616 &pageid=icb.page126127 The submission deadline is this Thursday 5 PM. If for some reason you don't have access to the dropbox please submit directly to both TFs via email. Thanks, Jens _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _____ Lesen Sie Ihre E-Mails jetzt einfach von unterwegs mit <http://uk.rd.yahoo.com/evt=51524/*http:/de.mobile.yahoo.com/interstitial?re fer=e00127%0d%0a> Yahoo! Go.

You should write it like this: avg <- function(x){ out <- sum(x)/length(x) return(out) } such that the two commands (storing *out* and returning *out*) are on separate lines. R is interpreting them as the same command in the way you've written it. Alternatively, you can end the line using a semicolon to tell R to move on to the next command. avg <- function(x){out <- sum(x)/length(x); return(out)} However, cramped code is often more difficult to debug, so spacing it out and placing one command per line (as in the first example) is usually better programming practice. J On Feb 13, 2008 12:09 PM, Keith Schnakenberg <keith.schnakenberg at gmail.com> wrote:

You have to put the code on separate lines. avg <- function(x) { out <- sum(x)/length(x) return(out) } Sometimes its helpful to use local variables inside of a function declaration to express a long calculation. On Feb 13, 2008 12:09 PM, Keith Schnakenberg <keith.schnakenberg at gmail.com> wrote:

Thank you John, Jon, and Albert.