finding the 10 lowest values

2011 10 13
3 个回答
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更新时间：2017 2 23
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I have a matrix with a lot of data, and i want to find the 10 lowest values of a specific collum.
Does anybody know how to do that?
i was thinking about using the function min() but it does not allow me to select a specific collum, or finding more than the one value which is the lowest.

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Artik Crazy
Artik Crazy 2011-10-13

1 个投票

  • Let's say you have a matrix of 10x10:
x=rand (10,10);
  • Sort it by the columns in ascending order:
y=sort (x,1, 'ascend')
*Now take the 5 first rows - these are the lowest values in every column:
z=y(1:5, :)

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the cyclist
the cyclist 2011-10-13

3 个投票

First 10 values of "sorted_x" is what you want.
A = rand(100,10);
columnToSort = 7;
[sorted_x, index] = sort(A(:,columnToSort),'ascend');
Marc
Marc 2017-2-23

0 个投票

But if I want the indexes of these 10 values? Should I sort to find the values and then "find" these values in the matrix?
Is there a more elegant way?

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Adam
Adam 2017-2-23
the cyclist gave an answer that also returns indices. You can just feed these directly into your array.

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