Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Puneet
Posts:
14
Registered:
8/12/13


Re: matrix mean
Posted:
Sep 10, 2013 5:41 AM


dpb <none@non.net> wrote in message <l0lbpf$lel$1@speranza.aioe.org>... > On 9/9/2013 6:40 AM, Puneet wrote: > > Hi  this is begginers question. > > I have a data set  16 rows and 16 columns  I would like to average > > every 2 points to get an 8 rows 8 columns matrix. > > > > This is a learning phase so I can run something similar later for larger > > data sets. > > Thanks. > > One way...(not necessarily the best :) ) presuming that the "every 2 > points" means in both directions given the resulting size of output for > the described input. Similar works w/ filter() for the vector case. > > m4=filter2(ones(2)/4,z); > m4=m4(1:2:end,1:2:end); > > Hint: look up 2D convolution... :) > > accumarray() could be you friend amongst other ways to attack it... > > 
i would like to rephrase my query. if i have a row vector of length 16 and i want to average every 2 consecutive elements and save it as a row vector, then how should i go about it. i know its a beginner query but may be its too specific as a really couldn't find it any where or even close to it.



