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Garrett Euler

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signal processing in seismology

 

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Files Posted by Garrett View all
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04 Apr 2008 matchsort Replicate a sort operation using the returned permutation indices Author: Garrett Euler matrices, sort, replicate, matchsort, matrix manipulation 2 3
03 Apr 2008 sort2li Transforms permutation indices from sort to linear indices Author: Garrett Euler matrices, sort indices, transforms, permutation, incides, matrix manipulation 0 0
03 Apr 2008 submat_noeval Returns the input matrix reduced along indicated dimensions (without eval) Author: Garrett Euler matrices, submatrix subset suba... 0 3
26 Mar 2008 submat Returns the input matrix reduced along indicated dimensions Author: Garrett Euler matrices, submatrix subset suba... 0 2
Comments and Ratings on Garrett's Files View all
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03 Apr 2008 submat_noeval Returns the input matrix reduced along indicated dimensions (without eval) Author: Garrett Euler Euler, Garrett

Yea I did not know that one. Matlab takes the string ':' as a special case when indexing matrices...anything else like '1:2' etc though doesn't work without an eval. Thanks, I'll update!

03 Apr 2008 submat_noeval Returns the input matrix reduced along indicated dimensions (without eval) Author: Garrett Euler x@y.z, Jos

I have some problems understanding this code:
Apparently, -- Y = submat_noeval(X,D,F) -- is the same as -- ind(1:ndims(X)) = {':'} ; ind{D} = F ; Y = X(ind{:}) --

which would allow for a much simpler code:
Y = fun(X,varargin)
ind(1:ndims(X)) = {':'} ;
i = 1:2:nargin-1 ;
ind{[varargin{i}]} = deal(varargin{i+1}) ;
Y = X(ind{:}) ;

Please correct me if I am wrong ...
03 Apr 2008 matchsort Replicate a sort operation using the returned permutation indices Author: Garrett Euler D'Errico, John

I''ll concede that as a valid use.
02 Apr 2008 matchsort Replicate a sort operation using the returned permutation indices Author: Garrett Euler Euler, Garrett

Sure its trivial if x is a vector...not as much if x is a n-d matrix sorted down an arbitrary dimension. Note that your example won't work for anything other than a vector. This function is useful for parallel sorting of matrices of 2+ dimensions.

A clearer example:
a=magic(10);
b=1./a
c=-a
[d,i]=sort(a,2)
e=matchsort(b,i,2)
f=matchsort(c,i,2)
isequal(d,1./e,-f)

02 Apr 2008 matchsort Replicate a sort operation using the returned permutation indices Author: Garrett Euler D'Errico, John

I'm confused. Exactly what does this function do that the trivial code below does not do?

[x,tags] = sort(x);
y = y(tags);

Top Tags Applied by Garrett
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matrices, matrix manipulation, submatrix subset subarray, incides, matchsort
Files Tagged by Garrett View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
04 Apr 2008 matchsort Replicate a sort operation using the returned permutation indices Author: Garrett Euler matrices, sort, replicate, matchsort, matrix manipulation 2 3
03 Apr 2008 sort2li Transforms permutation indices from sort to linear indices Author: Garrett Euler matrices, sort indices, transforms, permutation, incides, matrix manipulation 0 0
03 Apr 2008 submat_noeval Returns the input matrix reduced along indicated dimensions (without eval) Author: Garrett Euler matrices, submatrix subset suba... 0 3
26 Mar 2008 submat Returns the input matrix reduced along indicated dimensions Author: Garrett Euler matrices, submatrix subset suba... 0 2

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