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Part II Computational Physics - FAQ

Computational Physics 2007

Frequently asked questions

This page records some of the questions most frequently asked during the practical classes.

UNIX and X Windows

How can I access PWF Linux from college?
The network address of the Physics PWF Linux server is linux.phy.pwf.cam.ac.uk.
You should be able to access the server via a network connection using a secure shell (SSH).
More advice about accessing the server over the network is available here.

What is the Meta Key on the PWF PC keyboards?
The META key is the Right ALT key, often marked as "Alt Gr"

How do I get a "pipe" symbol?
This is the vertical bar, and is therefore "SHIFT+\"

Why do I get an input/output error when I attempt to save from the editor?
Probably because you have exceeded your disc allocation. Use the quota command to check your disc usage.
If the amount "Used" is close to the "Max" amount, then you will have to delete some files before you can save
anything new. In an xterm window, check for core files left behind after program crashes, and delete them.
Then look for large data files using "ls -l", and delete any that you no longer need.

Programming in Fortran 95

Why doesn't my first example program execute if I type ex1?
Probably because you haven't yet set up your .bash_login file. This should contain commands to configure
the system to look for commands in your current directory, in addition to commands already known to the system.
Copy the version from $PHYTEACH/part_2/bash_login to .bash_login in your home directory,
and then log out and log in again.