Indexing of cell array using cellfun

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!

Answer 1

[Sean de Wolski]

C = mat2cell(rand(100,2),ones(1,10)*10,2);
V = randperm(10).';
out = cellfun(@(c,idx)c(idx,:),C,num2cell(V))

perhaps?

Answer 2

[Jason Schroder]

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!

[Sean de Wolski]

Yup, see the edit.

Answer 3

[Jason Schroder]

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!

[Sean de Wolski]

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.