Indexing of cell array using cellfun

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Jason Schroder
Jason Schroder 2011-10-19
I have a cell array (10x1) where each cell is a numeric array (Mx2) and a vector with key indicies.
%Example [Code formatting SCd]
C=cell(10,1)
C{1}=rand(4,2)*10
C{2}=rand(5,2)*10...C{10}=rand(3,2)*10
V=1:10
I want to extract from C{1} the first element in V(1) C{2} the 2nd element of V(2)....
my initial thought was something like this, which of course doesn't work but...
out=cellfun(@(x) x(v(x),:),C, 'uniformoutput',false)
any suggestions on how do do this outside of a loop?
Thank You!

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回答（3 个）

Sean de Wolski
Sean de Wolski 2011-10-19
C = mat2cell(rand(100,2),ones(1,10)*10,2);
V = randperm(10).';
out = cellfun(@(c,idx)c(idx,:),C,num2cell(V))
perhaps?
Jason Schroder
Jason Schroder 2011-10-19
Thanks Sean, this is close, but I don't think I was very clear in my question.
What I really want is this C{x}(V(x),:)
you code is spitting out C{x}(v(1),2)
Thanks though!
Jason Schroder
Jason Schroder 2011-10-19
Actually Sean it DOES work, I just had to add the 'uniformoutput', false and it works great thanks! It goes to show I don't really understand the use of anonymous functions
if I understand this correctly your function is the equivalent of C{c}(V(idx),:)?
Anyways, thanks a bunch for your help!
  1 个评论
Sean de Wolski
Sean de Wolski 2011-10-19
that's what it is now that I made the edit. Basically it takes two 10x1 cells and does the same thing to each row of cells:
so
C(1)then the V(1) or V(1,:) parts etc.

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