how to compare a line a of matrix with another ?

1 次查看（过去 30 天）
Paul Nanfah
Paul Nanfah 2015-6-17
编辑： dpb 2015-6-23
hello, giving the following matrix :
matrix=[5 6 4;3 4 4;5 6 4;7 8 4;9 10 4;1 2 4];
I want to compare the first 2 elements of each rows and display a message if 2(or more) of them have the same elements
I tried to do it this way:
matrix=[5 6 4;3 4 4;5 6 4;7 8 4;9 10 4;1 2 4];
for i=1:size(matrix,1)
a=matrix(i,1);
for k=1:size(matrix,2)
b=matrix(k,2);
m1=[a b];
end
end
for i=1:size(matrix,1)
c=matrix(i,1);
for k=1:size(matrix,2)
d=matrix(k,2);
m2 =[c d];
end
end
if m2==m1
disp('YOU GOT IT !!');
end
matrix
I created 2 vectors m1 and m2 with the values of the first elements and then compare the vectors.
but I dont get any positve results.

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2015-6-17
>> if size(unique(matrix(:,1:2),'rows'),1)<size(matrix,1)
disp('Is at least one match')
else
disp('All unique')
end
Is match
>>
  5 个评论
显示 3更早的评论
Paul Nanfah
Paul Nanfah 2015-6-22
编辑：Paul Nanfah 2015-6-22
sry that the first command was not clear, I actualy meant the command "Is match" at the end of your code seems to be of no use, unless I am wrong.
dpb
dpb 2015-6-22
编辑：dpb 2015-6-23
Oh, I see...actually, that's output from the command line, not a command at all (as is shown by it's not preceded by the prompt >> characters and isn't part of a continuing code block as the previous lines from if to the end). I initially had only that string as the disp argument for the match; I expanded it when pasting in the Answer by inserting the "at least one" phrase to make the resulting message more explicit but didn't do the same with the previous output so the two don't match...

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by