find the nearest value
75 views (last 30 days)
Show older comments
Hi!
Can someone help with this problem please.....
if for example, q = [1 3 6 8 10 15]
find(q==8) returns ans = 4
find(q==9) returns Empty matrix: 1-by-0 because there is no value 9
...how do I query, find the value in q that is nearest to 9??
0 Comments
Accepted Answer
More Answers (1)
mohamed azuan wahari
on 9 May 2016
Edited: Walter Roberson
on 9 May 2016
find nearest value on matrix
Can someone help with this problem please.....
for example
a= 1250
matrix_b=[98 125 945 1005;
105 204 1105 1249;
200 250 1299 1450;
300 450 1350 1850]
want to find nearest equal or greater than a=1250
and the answer should be 1299
2 Comments
Walter Roberson
on 9 May 2016
v = sort(matrix_b(:));
vidx = floor(interp1(v, 1:length(v), a, 'linear', 'extrap'));
if vidx ~= 0
result = b(vidx);
end
Or
v = sort(matrix_b(:));
vidx = find(v >= a, 1, 'first');
if ~isempty(vidx)
result = v(vidx);
end
or
v = sort(matrix_b(:));
[~, vidx] = histc(a, v);
if vidx ~= 0
result = v(vidx);
end
The middle of these is probably the easiest to think about, but it cannot be generalized to a list of a values like the other ones can (aside from the testing to be sure that a result was found.)
Walter Roberson
on 9 May 2016
If you have R2016a or later, then
v = sort(matrix_b(:));
result = interp1(v, v, a, 'previous');
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!