Welcome to the Wiki page of the course '''Search Engines, WS 2009 / 2010'''. Lecturer: [[http://ad.informatik.uni-freiburg.de/staff/bast|Hannah Bast]]. Tutorials: [[http://ad.informatik.uni-freiburg.de/staff/celikik|Marjan Celikik]]. Course web page: [[http://ad.informatik.uni-freiburg.de/teaching/winter-term-2009-2010/suchmaschinen-vorlesung|click here]].

= Exercise Sheet 1 =
[[attachment:SearchEnginesWS0910/ExerciseSheet1/lecture-1.pdf|Here is a PDF of the slides of Lecture 1]].

[[attachment:SearchEnginesWS0910/ExerciseSheet1/exercise-1.pdf|Here is a PDF of Exercise Sheet 1]].

[[SearchEnginesWS0910/StudentIntros|Introduce yourself on this page please (Exercise 1)]].

[[SearchEnginesWS0910/ExerciseSheet1|Upload your results to Exercise Sheet 1 on this page please]].

== Questions or comments below this line, most recent on top please ==

Thank you for the response. Does this also concern the inverted index? I'm wondering because the slides only contain examples where the list of documents is a set and does not contain duplicate entries. Personally, I could imagine a pratical use for both variants. That's why i'm asking. Thanks again in advance. '''Björn 25Oct09 7:20pm'''

Hi Björn + all: occurrence always means individual occurrence, that is, if a collection has two documents and the word x occurs once in the first document and twice in the second document then there are three occurrences of this word overall. Ok? '''Hannah 25Oct09 2:12pm'''

To Zhongjie + all: you are right, you can't add the #acl line to the document yourself, so I just did it for you. I will change the instructions on the upload page accordingly. Sorry for this initial confusion, but hey, good that we have a Wiki. '''Hannah 25Oct09 2:06pm'''

Hey everyone! Whenever the exercise is talking about frequencies and occurences. Does it talk about occurences in different documents or should we considre multiple occurences in the same document. Thanks a lot. '''Björn 25Oct09 12:49pm'''

To Johannes: How did you solve the problem? I have logged in my account as my name, and my email links only this account. But I still get the error message 'You can't change ACLs on this page since you have no admin rights on it! ' when I try to enter '#acl ZhongjieCai:read,write -All:read ' to the first line of the page... '''Zhongjie 25Oct09 01:15am'''

Problem solved. To everybody: don't try to create multiple users with the same e-mail address. '''Johannes 25Oct09 00:21am'''

Oh, I see, well that *must* be your user name. Sorry for not making that clear earlier. Please create an account with that user name and try again. '''Hannah 25Oct09 00:02am'''

No that is not my user name. '''Johannes 24Oct09 11:58pm'''

Hi Johannes, if you are logged in as JohannesStork you should be able to see it, did you try that? '''Hannah 24Oct09 11:59pm'''

I don't know if this is the right place to ask, but I can't access my exercise page. It says "Sie dürfen diese Seite nicht ansehen." '''Johannes 24Oct09 11:50pm'''

Good question, Johannes. Please upload the source code separately, either as a .zip or .tgz archive. I have modified the instructions on the upload page accordingly. Sorry if that means additional work for you, we weren't expecting anybody to submit so early ... '''Hannah 24Oct09 11:43pm'''

Shall we put the whole source into the PDF? What about tar.gz? '''Johannes 24Oct09 5:18pm'''

Hi Johannes + all, the slides are now availabe as PDF, see the link above. '''Hannah 23Oct09 17:04'''

'''Note about Exercise 5:''' One can assume that a more general model of the word frequencies is given than that given in the lecture, i.e. eps * N * (1 / i^alpha). Now both parameters (eps and alpha) can be estimated simultaneously. '''Marjan 23Oct09 3:29pm'''

Can you provide the slides as PDF? '''Johannes 23Oct09 10:05am'''

Please note that the deadline for uploading your solutions of the exercises is always Monday, 23:59 (sharp). '''Marjan 22Oct09 6:15pm'''

When you add a question or comment here, please end it with your name and the date and time in bold face, just like I did now. '''Hannah 22Oct09 01:59am'''