This document will tell you how to start running atlas after you have done Download and Install. These instructions work best for the latest version.
Get atlas running¶
Let’s say you compiled the software in a directory atlasofliegroups, or perhaps you put a pre-compiled binary there. Use your terminal to navigate into that directory. It should contain the executable files Fokko and atlas, and subdirectories “messages” (help files for Fokko) and “atlas-scripts” (auxiliary and help files for atlas).
Once you are there, depending on your setting, do either:
You should then see something like this:
This is 'atlas' (version 0.6, axis language version 0.9), the Atlas of Lie Groups and Representations interpreter, compiled on Jan 19 2016 at 02:21:55. http://www.liegroups.org/ atlas>
Alternatively, you can cd into the atlas-scripts folder, then do:
The folder atlas-scripts includes scripts, like “basics.at”, that define a collection of functions complementing the primitive functions built into atlas.
Assuming you are in the atlas environment (when you see
atlas> in your terminal), here is how to load some scripts. For example, to load the file “basic.at” do:
You will see atlas output:
Starting to read from file 'atlas-scripts//basic.at'. Added definition  of #: (int->[int]) Added definition  of #: (bool->int) ...
Once this is working, you can and should load other files. Load “all.at” to get a recommended set of files:
atlas> <all [... some atlas output ...] atlas>
To check if readline (command completion, recalling previous commands, etc.) is working, hit TAB on your keyboard twice. You should see something like:
atlas> Display all 902 possibilities? (y or n)
This indicates that command completion is working. Now do a few simple commands:
atlas> 1+1 Value: 2 atlas> set G=SL(2,R) Identifier G: RealForm atlas> print_block(trivial (G)) Parameter defines element 2 of the following block: 0: 0 [i1] 1 (2,*) *(x=0,lam=rho+ , nu= /1) e 1: 0 [i1] 0 (2,*) *(x=1,lam=rho+ , nu= /1) e 2: 1 [r1] 2 (0,1) *(x=2,lam=rho+ , nu= /1) 1^e
Congratulations! Now you have atlas working on your machine! Proceed to Tutorial for some examples of what you can do with atlas.