Repeat vs Repelem

[bonanza123]

Hi Stefan,

thanks a lot for you awesome library! I'm using it a lot.
Just a minor question: Did you compare your repeat function with MATLAB's repelem? If I'm not mistaken they are doing something very similar. repelem also seems to be native code.

[stefanengblom]

Thanks for the feedback! I am currently sitting on R2014b and it appears repelem() is R2016b so I haven't seen it. But yes, they seem pretty similar. -Can you see if the Matlab native code is viable? Would be interesting to see if they could make it as slick as mine... ;-) I think also the tprod() and tsum() functions from stenglib are nowadays essentially supported, but I don't know the details here. Cheers, Stefan

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On 2017-02-15 11:00, bonanza123 wrote: Hi Stefan, thanks a lot for you awesome library! I'm using it a lot. Just a minor question: Did you compare your repeat function with MATLAB's |repelem|? If I'm not mistaken they are doing something very similar. |repelem| also seems to be native code. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AC68W1iuKk9iteP-afqtkQm186CxXEKhks5rcszRgaJpZM4MBgwH>.

-- Stefan Engblom Division of Scientific Computing Department of Information Technology Uppsala University, Box 337 SE-751 05 Uppsala, Sweden Office: +46-18-471 27 54 Mobile: +46-70-620 62 20 http://user.it.uu.se/~stefane Member of the Young Academy of Sweden http://www.sverigesungaakademi.se/757.html

[bonanza123]

I just checked the documentation and it says that repelem has been introduced in R2015a.

Sorry, I don't exactly understand what you mean. Matlab puts out the following

>> which repelem
built-in (/net/sw/MATLAB/R2017a/toolbox/matlab/elmat/repelem)

However, there is a plain .m file having the source in
/net/sw/MATLAB/R2017a/toolbox/matlab/elmat/+matlab/+internal/+builtinhelper/repelem.m.
It seems to use a combination of accumarray and cumsum. And its by far not as beautiful as your code :-)