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I have been trying to install the Knot Theory package from the knot atlas, but have been unsuccessful. Firstly I tried the command

<< KnotTheory`

but received a failure message. I then proceeded to modify the directory using the the AppendTo[$Path, "DIRECTORY"] command, and still receive the same failure message.

What is going wrong?

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  • $\begingroup$ Check if $Path contains your directory. Or specify the full pathname. B.t.w. you can also use Needs $\endgroup$ Dec 23, 2020 at 8:34
  • $\begingroup$ The same with me "Get::noopen: Cannot open KnotTheory`". $\endgroup$
    – user64494
    Dec 23, 2020 at 10:16

2 Answers 2

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i downloaded and unzipped the package in

C:\Parent

Appended the path as it is explained:

AppendTo[$Path, "C:\\Parent"]

There were some errors during the import

<<KnotTheory`
ParentDirectory::nums: Argument File should be a positive machine-size integer, a nonempty string, or a File specification.
ParentDirectory::nums: Argument File should be a positive machine-size integer, a nonempty string, or a File specification.
ToFileName::strse: String or list of strings expected at position 1 in ToFileName[{File,WikiLink,mathematica}].
ToFileName::strse: String or list of strings expected at position 1 in ToFileName[{File,QuantumGroups}].
Loading KnotTheory` version of September 6, 2014, 13:37:37.2841.
Read more at http://katlas.org/wiki/KnotTheory.

but some of the functions work:

In[8]:= KnotTheoryVersion[]
Out[8]= {2014,9,6,13,37,37.2841}

Mathematica version: 12

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Here is my workaround for this problem. (The package is assumed to be unzipped in "C:/Parent" directory.)

(1) Find the "init.m" file in the directory "C:/Parent/KnotTheory".

(2) Open the file with a text editor, and replace the lines 51-53

    KnotTheoryDirectory[] = (File /.Flatten[FileInformation[ToFileName[#,"KnotTheory"]] & /@ ($Path /. "." ->Directory[])])

by

KnotTheoryDirectory[] = "C:/Parent"

(3) Save the "init.m" file.

(4) Add the installation directory to the search path:

AppendTo[$Path,"C:/Parent"]

(5) You can use the package by

Needs["KnotTheory`"]
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