selecting desired values

2 次查看（过去 30 天）
FIR
FIR 2011-11-1
i gave some data
column1 column2
1,1 3,4
1,2
1,3
;
;
;
1,100 3,100
2,1
;
;
;
2,100 4,100
I want to select 15 values from each 100 ,the values in column should not change,,
(i.e) 1,1..1,15...2,1...2,15...3,1...3,15...4,1..4,15
can u tell how to process

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2011-11-1
[j1,i1] = ndgrid(1:100,1:4);
ind = [i1(:) j1(:)];
somedata = ind(randperm(numel(i1)),:);
idx = bsxfun(@plus,(1:15)',0:100:numel(i1)-1);
out = somedata(idx,:);

更多回答（1 个）

Lulu
Lulu 2011-11-1
Do you want to select values based on indices? If so, then here is an example: ind = [1; 2; 5; 15]; col1 = array(ind,1); col2 = array(ind,2);
  1 个评论
FIR
FIR 2011-11-1
not on indices first 15 from 100 without changing value in columns

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