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Selecting random points from data file

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amberly hadden
amberly hadden 2014-12-12
评论： amberly hadden 2014-12-12
Hi, is there any algorethim to select random points from a large data file. Lets say I want to select data after every 20 values. x = [1:0.1:1000]
If I want y = select every 10th 20th or 50th point of x
Thanks Amb
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amberly hadden
amberly hadden 2014-12-12
Sorry if its not clear I mean to write pick every 10th or 20th point of x.
Amb
amberly hadden
amberly hadden 2014-12-12
sorry random means scanig rando area up down lesft right

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Mohammad Abouali
Mohammad Abouali 2014-12-12
x = [1:0.1:1000];
x_every10th=x(10:10:numel(x));
x_every20th=x(20:20:numel(x));
x_every50th=x(50:50:numel(x));
You get the idea.
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amberly hadden
amberly hadden 2014-12-12
yeah I have a 307000*3 matrix
want to select every 10th row. Is there any wany to data from random rows lets say for region I'm more interested I can select every 20th point for region Im not much interested slect every 50th and close to my sourse select every 10th point.
Thanks much apriciated
amberly hadden
amberly hadden 2014-12-12
another thing I want out put in 3 columns its just producing one column.

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-12-12
x = [1:0.1:1000];
n=randi(5)*10
out=x(n:n:end)

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