How to Group strings?

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Vihar Chervenkov
Vihar Chervenkov 2013-4-12
Hi Everyone,
How can I group strings based on their values?
Example: a=[1 2 3 4]; b=[0 5 3 5]; c=[9 4 7 7]; d=[9 7 3 1];
I want to make a group of the strings that have value of 3 in their 3rd column. Those will be a,b and d.
Can 1 string perticipate in more than one groups? For example Group 1 is the already mentioned one, and Group 2 would be made of the strings that have value of 9 in the 1st column. Those will be strings c and d.
Cheers, Vihar
  1 个评论
Jan
Jan 2013-4-12
编辑：Jan 2013-4-12
"String" means a [1 x N] vector of type char in Matlab. Using the correct terms is essential when discussing about a programming language.

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采纳的回答

Jan
Jan 2013-4-12
Storing the data in different variables is not efficient. This would be much faster and easier to expand:
Data = [1 2 3 4; ...
0 5 3 5; ...
9 4 7 7; ...
9 7 3 1];
Group{1} = find(Data(:, 3) == 3);
Group{2} = find(Data(:, 1) == 9);
And even the outputs should not be numbered, but collected in a cell array.

更多回答（1 个）

Yao Li
Yao Li 2013-4-12
a(1,1:4)=[1 2 3 4];
a(2,1:4)=[0 5 3 5];
a(3,1:4)=[9 4 7 7];
a(4,1:4)=[9 7 3 1];
j=1;
k=1;
for i=1:4
if((find(a(i,1:4)==3)==3)+(find(a(i,1:4)==9)==1)==2)
group_1(j,1:4)=a(i,1:4);
j=j+1;
group_2(k,1:4)=a(i,1:4);
k=k+1;
else
if(find(a(i,1:4)==3)==3)
group_1(j,1:4)=a(i,1:4);
j=j+1;
elseif(find(a(i,1:4)==9)==1)
group_2(k,1:4)=a(i,1:4);
k=k+1;
else
end
end
end

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