The whole copyright stuff is a pain!  IANAL, but as far as I understand
it:
- it's ok to copy examples which have some open source licence, probably
  needing to keep that licence.
- it's ok to re-do someone elses examples as long as you don't look at
  source code.  However, that is probably a bit tricky as examples are
  usually mixed with code.
- if unsure, ask the original author.  This should work fine for
  academics and the like but probably less well for Mathworks.

This could be a PDE example to look into:
http://wiki.scipy.org/PerformancePython

Tutorials/examples would definitely be useful!

On Thu, 2014-11-20 at 21:17, Christoph Ortner <[email protected]> 
wrote:
> I've also removed the notebook.
>
> On Thursday, 20 November 2014 20:15:51 UTC, Christoph Ortner wrote:
>>
>> too bad. Anyhow, if I continue to develop a similar set of elementary 
>> tutorials, I will make them available.
>>    Christoph
>>
>>
>> On Thursday, 20 November 2014 19:29:34 UTC, Mauro wrote:
>>>
>>> The usual copyright issues apply here though: numgird and delsq are 
>>> copyrighted Matlab functions which you are not allowed to copy and even 
>>> less allowed post copied code.  Best re-implement them without looking 
>>> at the source code! 
>>>
>>> Same goes for all of http://uk.mathworks.com/examples/matlab 
>>>
>>> On Thu, 2014-11-20 at 20:23, Christoph Ortner <[email protected]> 
>>> wrote: 
>>> > I've put the current version at 
>>> >     
>>> https://dl.dropboxusercontent.com/u/9561945/JuliaNBs/Laplacian.ipynb 
>>> > 
>>> > Would there be any interest in porting a larger set of Matlab examples 
>>> to 
>>> > Julia? I wouldn't mind porting a subset of the "Mathematics" section on 
>>> >     http://uk.mathworks.com/examples/matlab 
>>> > 
>>> > This might be a small way how I could contribute here, as so far I've 
>>> > mostly been enjoying the benefits of everyone else's hard work :). 
>>> > 
>>> >     Christoph 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > On Thursday, 20 November 2014 17:33:25 UTC, Stefan Karpinski wrote: 
>>> >> 
>>> >> Yes, translation from Matlab to Julia is generally pretty easy. Would 
>>> be 
>>> >> cool to take a look at at the code you ended up with. 
>>> >> 
>>> >> On Thu, Nov 20, 2014 at 11:54 AM, Christoph Ortner <
>>> [email protected] 
>>> >> <javascript:>> wrote: 
>>> >> 
>>> >>> Turns out this was *very* quick to translate from the Matlab codes. 
>>> If 
>>> >>> there is any interest I can post my IJulia notebook somewhere. 
>>> >>> 
>>> >>> 
>>> >>> On Thursday, 20 November 2014 15:08:30 UTC, Christoph Ortner wrote: 
>>> >>>> 
>>> >>>> I am trying to port 
>>> >>>> 
>>> http://uk.mathworks.com/examples/matlab/1091-finite-difference-laplacian 
>>> >>>> to Julia for a quick Julia intro for some grad students at my 
>>> >>>> department. Has anybody ported `numgrid` and `delsq` ? 
>>> >>>> 
>>> >>>> Thanks, 
>>> >>>>    Christoph 
>>> >>>> 
>>> >>>> 
>>> >> 
>>>
>>>

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