I am trying to obtain a series of vectors made of elements from a larger vector given they exceed a threshold
2 views (last 30 days)
Show older comments
I have Z=[6 7 8 5 6 7 8 3 2 4]' vector
for i=1:10; A(i) =Z(Z>Z(i)); end
For some reason its not working
0 Comments
Answers (2)
Matthew Eicholtz
on 5 Apr 2016
Edited: Matthew Eicholtz
on 5 Apr 2016
The reason your code does not currently work is because you are trying to assign a vector ( Z(Z>Z(i)) ) to a scalar element in a numeric array ( A(i) ). Since the size of your vector may vary on each iteration, I suggest using a cell array.
To do this, just change A(i) to A{i}.
3 Comments
Matthew Eicholtz
on 5 Apr 2016
An alternative approach if you do not want to use a cell array is to create a logical mask as follows:
Z = [6 7 8 5 6 7 8 3 2 4]';
mask = bsxfun(@gt,Z,Z');
Then, if you want to get the elements that are greater than the 4th element, for example, use:
Z(mask(:,4))
Roger Stafford
on 5 Apr 2016
It's not clear whether you want those Z elements which exceed some fixed value or those which make up a monotone increasing sequence.
For a fixed value L:
A = Z(Z>L);
For selecting only those Z which constitute a monotone increasing sequence:
t(1) = true;
for k = 2:length(Z)
t(k) = (max(Z(1:k-1))<Z(k));
end
A = Z(t);
0 Comments
See Also
Categories
Find more on Multidimensional Arrays 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!