Extending/Modifying KnotTheory` - Revision history

Drorbn: Reverted edits by CnaliCnatr (Talk); changed back to last version by Scott

2008-12-19T23:57:42Z

Reverted edits by CnaliCnatr (Talk); changed back to last version by Scott

← Older revision		Revision as of 19:57, 19 December 2008
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CnaliCnatr: paslap

2008-12-19T23:26:52Z

paslap

← Older revision		Revision as of 19:26, 19 December 2008
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Scott: revert vandalism

2007-08-28T23:29:25Z

revert vandalism

Show changes

221.2.229.139 at 14:08, 28 August 2007

2007-08-28T14:08:28Z

Show changes

163.28.4.1 at 13:09, 28 August 2007

2007-08-28T13:09:50Z

@@ Line 1: / Line 1: @@
 Anybody is welcome, indeed encouraged, to fix, modify or extend the package <code>KnotTheory`</code> to the benefit of everybody else. This note explains how this can be done and outlines some of the conventions used within <code>KnotTheory`</code>.
@@ Line 47: / Line 47: @@
         DirectoryName[
           File/.Flatten[
-              FileInformation[ToFileName[#,"LinKnots.m"]]&/@$Path]];
+              FileInformation[ToFileName[#,"LinKnots.m"]]

Drorbn: Reverted edit of 125.180.110.161, changed back to last version by Drorbn

2007-06-14T15:10:26Z

Reverted edit of 125.180.110.161, changed back to last version by Drorbn

@@ Line 47: / Line 47: @@
         DirectoryName[
           File/.Flatten[
-              FileInformation[ToFileName[#,"LinKnots.m"]]</pre>
+              FileInformation[ToFileName[#,"LinKnots.m"]]&/@$Path]];

125.180.110.161 at 03:23, 14 June 2007

2007-06-14T03:23:04Z

@@ Line 47: / Line 47: @@
         DirectoryName[
           File/.Flatten[
-              FileInformation[ToFileName[#,"LinKnots.m"]]&/@$Path]];
+              FileInformation[ToFileName[#,"LinKnots.m"]]</pre>

Drorbn: Reverted edit of 86.122.87.13, changed back to last version by Scott

2007-06-13T18:05:36Z

Reverted edit of 86.122.87.13, changed back to last version by Scott

@@ Line 47: / Line 47: @@
         DirectoryName[
           File/.Flatten[
-              FileInformation[ToFileName[#,"LinKnots.m"]]</pre>
+              FileInformation[ToFileName[#,"LinKnots.m"]]&/@$Path]];

86.122.87.13 at 16:37, 13 June 2007

2007-06-13T16:37:23Z

@@ Line 47: / Line 47: @@
         DirectoryName[
           File/.Flatten[
-              FileInformation[ToFileName[#,"LinKnots.m"]]&/@$Path]];
+              FileInformation[ToFileName[#,"LinKnots.m"]]</pre>

Scott: /* Global` symbols */

2007-05-28T06:05:11Z

Global` symbols

← Older revision		Revision as of 02:05, 28 May 2007
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	=====Global` symbols=====		=====Global` symbols=====
	Fixing leakages from KnotTheory` wasn't too hard; just load KnotTheory` in a fresh Mathematica session, then issue the command Names["Global`*"]. There shouldn't be much there, and it's mostly a matter of tracking down where the stray symbols have been introduced. If you don't understand Mathematica's (utterly ugly) system of contexts, you'll start to get the hang of it doing this!		Fixing leakages from KnotTheory` wasn't too hard; just load KnotTheory` in a fresh Mathematica session, then issue the command Names["Global`*"]. There shouldn't be much there, and it's mostly a matter of tracking down where the stray symbols have been introduced. If you don't understand Mathematica's (utterly ugly) system of contexts, you'll start to get the hang of it while doing this!

	Leakages from LinKnot` were much more serious, as several subpackages were loaded directly into the Global` context (the authors of K2K didn't follow the usual Mathematica package conventions).		Leakages from LinKnot` were much more serious, as several subpackages were loaded directly into the Global` context (the authors of K2K didn't follow the usual Mathematica package conventions).

	At this point we discovered the first of several painful problems associated with symbols in contexts which aren't currently on the context path, namely that conversions to and from strings (with ToString and ToExpression) are very dangerous. These happen 'at runtime', so the context path could be quite arbitrary (that is, having been modified by other packages or users since the package was loaded), rather than at the moment the package is loaded. It is often necessary to wrap calls to ToExpression with code which temporarily resets the context path. Seaching to ToExpression in the LinKnot sources should find examples of this.		At this point we discovered the first of several painful problems associated with symbols in contexts which aren't currently on the context path, namely that conversions to and from strings (with ToString and ToExpression) are very dangerous. These happen 'at runtime', so the context path could be quite arbitrary (that is, having been modified by other packages or users since the package was loaded), rather than at the moment the package is loaded. It is often necessary to wrap calls to ToExpression with code which temporarily resets the context path. Seaching for ToExpression in the LinKnot sources should find examples of this.

	=====Current working directory=====		=====Current working directory=====