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Help: sort a m by n matrix

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Khanh
Khanh 2014-9-17
评论： Khanh 2014-9-17
Hi,
I have a 4 by 2 matrix. c=[2205 300; 7281 300; 3535 600; 5944 600] and want to sort the 1st colum and the 2nd colum by the 1st one. The result I want to obtain is a 4 by 2 matrix like this c'= [2205 300; 3535 600; 5944 600; 7281 300].
I also wrote a script to do it. For convenience, is there a buit-in function MATLAB to do it?
My script:
for i=1:size(c,1)
if i<size(c,1)
if c(i,1)>c(i+1,1)
xiold=c(i,1)
xi1old=c(i+1,1)
yiold=c(i,2)
yi1old=c(i+1,2)
c(i,1)=xi1old
c(i+1,1)=xiold
c(i,2)=yi1old
c(i+1,2)=yiold
end
end
end
Khanh

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采纳的回答

Hikaru
Hikaru 2014-9-17
Yes, there is a built-in function.
c1 = sortrows(c,1)
  2 个评论
Roger Stafford
Roger Stafford 2014-9-17
That would leave the second column unsorted. It should either be
c1 = sortrows(c);
or
c1 = sortrows(c,[1,2]);

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