How to check value in matrix from 2 specific column

2 次查看（过去 30 天）
Chau Chin Haw
Chau Chin Haw 2020-12-21
回答： Image Analyst 2020-12-21
I have a data of
linedata = [1 1 2 2
2 2 3 1.5
3 3 4 2.2
4 4 5 6.8
5 4 6 1
6 5 7 5.1
7 6 8 2.5
8 7 9 3.3
9 8 10 2.8
10 8 11 1.4
11 10 12 3.2
12 11 13 2.7
13 12 14 1.9
14 13 15 4.5];
I would like to ask how can i check for value 7 and 8 in column 2 and column 3. I am using find function to find the value but it cant seems to work. Can anyone help? Thanks in advance.
  2 个评论
the cyclist
the cyclist 2020-12-21
It is unclear to me exactly what you want. Do you want to check the two columns separately? Or are you trying to check the condition in both columns?
For example, are you trying to check if column 2 is equal to 7, while column 3 is equal to 8?
Do you need the indices, or is logical output ok?
Can you tell us what exactly you expect the output to be for this input? (Better to express it in MATLAB syntax, not English words.)
Chau Chin Haw
Chau Chin Haw 2020-12-21
sorry there are some mistake in my question.
linedata = [1 1 2 2
2 2 3 1.5
3 3 4 2.2
4 4 5 6.8
5 4 6 1
6 5 7 5.1
7 6 8 2.5
8 7 9 3.3
9 8 10 2.8
10 8 11 1.4
11 10 12 3.2
12 11 13 2.7
13 12 14 1.9
14 13 15 4.5];
% Check value 7 and value 8 in column 2
tried using find function
row_check(i)=find(linedata(:,2)==col2(i))
but error occur
Unable to perform assignment because the left and right sides have a different number of elements

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回答（1 个）

Image Analyst
Image Analyst 2020-12-21
Explain exactly what "check for" means. Until then, try
% See if row 7 and 8, both in column 2, match
if linedata(7, 2) == linedata(8, 2)
fprintf(['linedata(7, 2) equals linedata(8, 2)\n');
else
fprintf(['linedata(7, 2) does not equal linedata(8, 2)\n');
end
% See if row 7 and 8, both in column 2, match
if linedata(7, 3) == linedata(8, 3)
fprintf(['linedata(7, 3) equals linedata(8, 3)\n');
else
fprintf(['linedata(7, 3) does not equal linedata(8, 3)\n');
end

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