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Week 3

A summary of useful weblinks:

  1. Email Dr Joan Adler with general questions.
  2. Email Dr Joan Adler with your targil solutions.
  3. Class email list.
  4. With fortran and c we will be using pgplot graphics and a listing of the different subroutines can be found on the local pgplot subroutines page.


  • If you need help on Targil 1 or 2 on random walks I will give at the end of class today.
  • I can also discuss projects then. The project can be related to your thesis research, e.g. a model simulation if you are an experimentalist or a numerical example of your theory if you are a theorist, but not part of your thesis research. It could also be related to the course you are teaching, or to something that interests you in another course you are taking. See the project information page for more details.
    Please everyone check you have a working account and password on tx/t2 the problems last week were due to a bug in the computer that checks passwords; I should have realised this.
    If you want to know more about pgplot and view examples of different interfaces, two sample pgplot programs are listed on the http site. Some of these as of now still require adaption to gfortran. The programs are ready to be compiled, please note that pspell.f needs the file param.e7 to be present in the same directory.
  • You should also look at the targil5 page some time soon and start completing the tasks listed there.
  • Printing: sometime this week a printer called bw is moving to Rm 315. It can be accessed from phelafel in one of 3 ways to print the file called ``cat'' or `` cat.ps ''.:
    1. remotely, if you are ssh'ed into phelafel by either the command lpr -P bw cat.ps for a postscript file.
    2. remotely, if you are ssh'ed into phelafel by either the command enscript -P bw cat for an ascii file.
    3. from a browser or acrobat reader or PrtSC button on the phelafel screen.
    Since it is my printer, I'd appreciate using it for class stuff only, and email me if there are problems. The printer is meant for physics department undergrads since there seem to be issues printing in the library.


    For those of you who have not taken a class in analytical mechanics, you need to prepare for the lecture after the next one by looking at one of the texts of this class or asking one of the physics students to explain a bit about Hamilton's equations.


    This week we will continue learning about the different types of Computational Physics: turning to the three main techniques of numerical analysis that are used for the solution of equations. These are numerical differentiation, quadrature and finding roots. The reference material is chapter 1 of Koonin (and Meredith). You can view this text at this link: link. I expect different levels of knowledge about these depending on students' backgrounds, and recommend careful reading of this chapter 1 for those of you who feel you need extra help.

    Useful programs for doing these operations are can also be downloaded (see instructions) as a tar file like we did last week. All these programs (e.g. name.f) do not need pgplot so can be run on any unix system, and are compiled with gfortran name.f -o name.ex

    This weeks material forms the basis for question 1 of the third targil, . You will not be able to answer question 2 (based on chapter 2 material) until at least the next lecture, if not the one after, but it is a good idea to get started on question 1 already this week.

    Time permitting we will stop 15 mins early for the tasks listed above and also so those who need help starting their webpages can get it. If you already have a page you will be excused; if you need more help stay on.

  • The first thing you need is an account on phelafel., which we will call ``username''.
  • Then you need to go into it and do the commands on webpage.html.
  • Then scp, but with webpage.html instead of a tar file into the directory public_html, the sample page.
  • Then you edit this page with your info and a photo.
  • If you call it index.html your address will be http://phelafel.technion.ac.il/~username". Please nothing illegally copied (like music), commercial, political or unsuitable. Feel free to put anything else there.

    Back to the index page


  • For more information about the Computational Physics Group at the

    Technion - Israel Institute of Technology

    see the

    Computational Physics Home Page