loop.plot cannot take multiple loops

[mbudisic]

loop.plot fails when a vector of loops is passed in a way that's not informative to the user.
Potential fixes: fail in a more informative way OR generate many axes each containing one row of the argument (not advisable) OR plot all loops on a single axis.

[mbudisic]

Commit 043b71d adds a temporary fix: assertion to make the error more transparent.

[jeanluct]

There may be something in the manual about plot now working on multiple loops.

[mbudisic]

Hm, I didn't think to check. In any case, error was ugly and non-informative (something about concatenation of coordinates in the internal getcoords function), so I pre-empted it with an assert.

[jeanluct]

I just mentioned it in case it needed modifying in the guide. It says "Some commands, such as \lstinline{plot}, do not vectorize." This seems fine as it is.

[mbudisic]

Perhaps we should close this as an issue and open a new enhancement instead to have braidlab be able to plot multiple loops - how to do that is a different discussion, I think.

[jeanluct]

We can just reclassify #133 as an enhancement. It would be good to keep this earlier discussion together with the issue.

[jeanluct]

Note: This issue was deferred during the refactor-loop-plot work. The refactoring branch (commit d3a8d1d) focused on issues #129, #141, and #144 first.

Support for multiple loops (loop vectors) is planned for a future phase but was not included in the current refactoring. The branch has been unmerged from develop for further testing.

This issue remains open for future implementation.