How to check value in matrix from 2 specific column

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.

[the cyclist]

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]

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

Answer 1

[Image Analyst]

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