License files from the FEX

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Jan
Jan 2012-6-18
评论： Steven Lord 2018-6-28
FEX submissions are accompanied by a file called "license.txt", which contains the name of the author. You can copy the files of a submission to a specific folder and include if in the Matlab path.
When a user downloads 100 submissions, there are two methods:
  • Either 100 folders are added to the path. This increases the danger of getting the strange and frequent "exhausted change notification handles" problems, see Solution 1-18IFI.
  • Save the functions to one folder and overwrite the license files. This does collide with the BSD license conditions.
Especially when I think about a tool, which automatically resolves dependencies to other FEX submissions, the pile of equivocal license files is a tedious obstacle. How can this problem be solved considering the large number of already existing submissions?

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采纳的回答

Daniel Shub
Daniel Shub 2012-6-19
You could download each FEX submission to a separate folder and then create links (hard or symbolic) to the MATLAB files (m, p, mex, etc.) in a single common folder for all FEX submissions. This might cause problems with name collisions to common files (e.g., contents.m).
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Jan
Jan 2012-6-20
The links are a good idea. The contents.m file is no problem here, because it should be re-created dynamically and contain the names of all functions contained inside a folder.
One problem is, that some submissions *require* specific subfolders, such that adding the folder to the PATH is obligatory. Therefore a full automatic package mamagement is not possible currently. However, the usability of the FEX is *decreasing* with a growing number of submissions, as long as there is no management function which resolves the depenencies.

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更多回答（2 个）

Jan
Jan 2012-6-20
The license.txt files could be renamed by appending the name of the submission, e.g. "licence.txt" to "license_typecast_.txt" for James' important, efficient and useful helper function FEX: 17476.
A lot of users are overwhelmed by the installation procedures of some submissions. I include a "please compile the code by mex -O abc.c before the first run" in the help section of the code, but I still get more questions for clarifications about the MEX command than comments or ratings. Therefore I hesitate to force the user to download and install another function and compile it in addition.
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Jan
Jan 2018-6-28
编辑：Jan 2018-6-28
SPDX is a nice and efficient solution:
% Copyright [year], [project founder], [project name], [contributors]
% SPDX-License-Identifier: BSD-2-Clause
% http://www.opensource.org/licenses/BSD-2-Clause
If this is inserted in the help section of each M and C file, every thing is fine and clear. Then an additional license.txt is not required.
Steven Lord
Steven Lord 2018-6-28
Consider using the Add-On Explorer to have MATLAB download and manage add-ons. If you do this, I believe it puts each in a separate directory to avoid potential conflicts like the license.txt files.

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Malcolm Lidierth
Malcolm Lidierth 2013-5-22
@Jan
I find lots of "installation procedure" enquiries also even though clear install instructions are provided. Often that is because users have read "between-the-lines" instead of taking the instructions literally - and their interpretation can be understandable e.g I see how a 10 year old caveat that "you must use "save -v6" might be interpreted as use "save -v[6 or 7]" in 2013.
For Waterloo, which has many files/folders/classes, I wrote a short script that uses MATLAB to do the download, unzip the files and set up the MATLAB and Java path - providing a few command line prompts/questions - in the present context that might be e.g "Have you run mex -setup before? If not do you want to run it now? [y/N]:"
Maybe the FEX should include an o[tional "Installation Script" button as well as a "Download Button" - providing script code to cut-and-paste into the Command Window when clicked, that could do this.
  1 个评论
Jan
Jan 2013-5-22
Thanks for your answer, Malcolm. In modern matlab versions the mex() command can reply, if the setup has been performed already. Unfortunately you cannot rely on FEX users to run a modern matlab version.
The install mechanism for Waterloo is fine for 99% of the cases. I do not have an internet connection on my Matlab computer to secure the stored patient data. Then an automatic downloading must fail, but it is impossible to guarantee a comfortable and flexible solution for all setups.

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