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


dpb
Posts:
9,089
Registered:
6/7/07


Re: Stupid question ;)
Posted:
May 8, 2013 11:45 PM


On 5/8/2013 10:10 PM, SK wrote: > Hi, > > I have a simple question but I did not manage to find the solution. > I am working on some block bootstrap resampling methods, and I need to > take a vector x with some data and divide it into blocks and then > resample these blocks. > > Let me show you one on simple example > > step 1 : I take x = [ 1:20 ] > step 2 : I created a matlab function that give me these blocks from x; > u = > > 1 4 7 10 13 16 > 2 5 8 11 14 17 > 3 6 9 12 15 18 > > step 3: I want now to create a vector or a matrix named B with > B(1)=u(:,1) > B(2)=u(:,2) > B(3)=u(:,3) > B(4)=u(:,4) > B(5)=u(:,5) > B(6)=u(:,6) > > How to create B? > > When I will have B, I will just create a lot of resamples with > replacement of these blocks > for example X = [ B(1) B(1) B(6) B(4) B(3) B(1)]
Just like you wrote itbut there's really no need; just use
X = [u(:,randperm(size(u,2)))];



Date

Subject

Author

5/8/13


SK

5/8/13


dpb

5/9/13


dpb


