finding nth elements in multiple arrays

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BoIs
BoIs 2016-11-7
评论： BoIs 2016-11-7
I have multiple cell arrays: [93x2 double] [216x2 double] [128x2 double][121x2 double] [ 90x2 double] ...so on. These correspond to XY plots,
plot(a{i}(:,1),a{i}(:,2))
opens a plot which looks as fig attached. I want to get the Y values at 1/4th, 1/2 and 3/4th of X for all cells. How can I go about doing this?
Thanks
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BoIs
BoIs 2016-11-7
I want separate values for what Im doing. I want those numbers for each of the cells individually.
BoIs
BoIs 2016-11-7
Yeah I wanted X by position. Thanks for the answer!

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采纳的回答

Walter Roberson
Walter Roberson 2016-11-7
Presuming Y is in the second column and that you want the 1/4 by position instead of by range:
cellfun( @(C) C(round([end/4, end/2, 3*end/4]), 2), YourCell, 'Uniform', 0)

更多回答（1 个）

KSSV
KSSV 2016-11-7
a = {rand(93,2) ;rand(216,2) ; rand(128,2) ; rand(121,2) ; rand(90,2)} ;
data = cell2mat(a) ;
% plot(data(:,1),data(:,2),'r') ;
N = length(data) ;
%%1/4th value
data(N/4,:)
%%1/2 value
data(N/2,:)
%%3/4th value
data(3*N/4,:)
Note that N should be divisible by 1/4,1/2 and 3/4. In this case it was. If not you should use fix. For Ex. data(fix(N/4),:) etc.

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