Setup

2008-07-13T18:56:49Z

ChilaVielp: roldar

reltroc
{{Manual TOC Sidebar}}

Start by downloading either the file [http://katlas.org/svn/KnotTheory/tags/stable/KnotTheory.tar.gz <tt>KnotTheory.tar.gz</tt>] or the file [http://katlas.org/svn/KnotTheory/tags/stable/KnotTheory.zip <tt>KnotTheory.zip</tt>] (around 3MB each), and unpack either one. This will create a subdirectory KnotTheory/ in your current working directory. This done, no installation is required (though you may wish to check out [[#Further Data Files|Further Data Files]] and/or [[#Setting the Path|Setting the Path]] below). Start Mathematica and you're ready to go:



<tt><font color=blue>In[1]:=</font></tt><code> << KnotTheory`</code>

<tt>Loading KnotTheory` version of July 7, 2007, 9:53:56.5473.
Read more at http://katlas.org/wiki/KnotTheory.</tt>


Notice the little "prime" at the end of <tt>KnotTheory</tt> above. It is a backquote (find it on the upper left side of most keyboards) and not a quote, and it really has to be there for things to work.

Let us check that everything is working well:



{{InOut|
n = 2 |
in = <nowiki>Alexander[Knot[6, 2]][t]</nowiki> |
out= <nowiki> -2 3 2
-3 - t + - + 3 t - t
t</nowiki>}}




{{HelpLine|
n = 3 |
in = <nowiki>KnotTheoryVersion</nowiki> |
out= <nowiki>KnotTheoryVersion[] returns the date of the current version of the
package KnotTheory`. KnotTheoryVersion[k] returns the kth field in
KnotTheoryVersion[].</nowiki>}}




{{HelpLine|
n = 4 |
in = <nowiki>KnotTheoryVersionString</nowiki> |
out= <nowiki>KnotTheoryVersionString[] returns a string containing the date and
time of the current version of the package KnotTheory`. It is generated
from KnotTheoryVersion[].</nowiki>}}




{{HelpLine|
n = 5 |
in = <nowiki>KnotTheoryWelcomeMessage</nowiki> |
out= <nowiki>KnotTheoryWelcomeMessage[] returns a string containing the welcome message
printed when KnotTheory` is first loaded.</nowiki>}}


Thus on the day this manual page was last changed, we had:



{{InOut|
n = 6 |
in = <nowiki>{KnotTheoryVersion[], KnotTheoryVersionString[]}</nowiki> |
out= <nowiki>{{2007, 7, 7, 9, 53, 56.5473}, July 7, 2007, 9:53:56.5473}</nowiki>}}




{{InOut|
n = 7 |
in = <nowiki>KnotTheoryWelcomeMessage[]</nowiki> |
out= <nowiki>Loading KnotTheory` version of July 7, 2007, 9:53:56.5473.
Read more at http://katlas.math.toronto.edu/wiki/KnotTheory.</nowiki>}}




{{HelpLine|
n = 8 |
in = <nowiki>KnotTheoryDirectory</nowiki> |
out= <nowiki>KnotTheoryDirectory[] returns the best guess KnotTheory` has for its
location on the host computer. It can be reset by the user.</nowiki>}}




{{InOut|
n = 9 |
in = <nowiki>KnotTheoryDirectory[]</nowiki> |
out= <nowiki>C:\drorbn\projects\KnotTheory\svn\trunk\KnotTheory</nowiki>}}


KnotTheoryDirectory may not work under some operating systems/environments. Please let [[User:Drorbn|Dror]] know if you encounter any difficulties.

===Notes===

====Precomputed Data====
<code>KnotTheory`</code> comes with a certain amount of precomputed data which is loaded "on demand" just when it is needed. When a precomputed data file is read by KnotTheory`, a notification message is displayed. To prevent these messages from appearing execute the command <code>Off[KnotTheory::loading]</code>.

====Further Data Files====
To access the Hoste-Thistlethwaite enumeration of knots with 12 to 16 crossings (see [[Naming and Enumeration]]), also download either the file [http://katlas.org/svn/KnotTheory/tags/stable/DTCodes4Knots12To16.tar.gz <tt>DTCodes4Knots12To16.tar.gz</tt>] or the file [http://katlas.org/svn/KnotTheory/tags/stable/DTCodes4Knots12To16.zip <tt>DTCodes4Knots12To16.zip</tt>] (about 9MB each), and unpack either one into the directory <tt>KnotTheory/</tt>.

====Setting the Path====
The directions above are written on the assumption that the package <tt>KnotTheory`</tt> (more precisely, the directory <tt>KnotTheory/</tt> containing the files that make this package), is somewhere on your Mathematica search path. Usually this will be the case if <tt>KnotTheory/</tt> is a subdirectory of your current working directory. If for some reason Mathematica cannot find <tt>KnotTheory`</tt>, you may tell it where to look in either of the following three ways. Assume <tt>KnotTheory/</tt> is a subdirectory of <tt>FullPathToKnotTheory</tt>:
# If you are using <tt>KnotTheory`</tt> rarely and you don't want to change system defaults, evaluate <tt>AppendTo[$Path,"FullPathToKnotTheory"]</tt> within Mathematica before attempting to load <tt>KnotTheory`</tt>.
# If you plan to use <tt>KnotTheory`</tt> often, you may want to move the directory <tt>KnotTheory/</tt> into one of the directories on your path. Evaluate <tt>$Path</tt> within Mathematica to see what those are.
# Alternatively, you may permanently add <tt>FullPathToKnotTheory</tt> to your <tt>$Path</tt>. To do that, find your Mathematica base directory by evaluating <tt>$BaseDirectory</tt> (on Dror's laptop, this comes out to be <tt>C:\ProgramData\Mathematica</tt>), and then add the line <tt>AppendTo[$Path,"FullPathToKnotTheory/"]</tt> to the file <tt>$BaseDirectory/Kernel/init.m</tt> and restart Mathematica.

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