exclude some elements in array

110 views (last 30 days)
Rica
Rica on 31 May 2021
Answered: Rica on 31 May 2021
Hi all,
how could i exclude the bold number from this arry. The array is large but it shows the structure that after each 5 element, 3 element should be excluded.
Thank you!
2.70850000000000
2.63220000000000
2.25820000000000
2.45430000000000
2.99680000000000
-54.2462960000000
NaN
NaN
2.25420000000000
2.92210000000000
1.70920000000000
2.06580000000000
2.17260000000000
3.1726950000000
NaN
NaN

Accepted Answer

Torsten
Torsten on 31 May 2021
last = numel(a);
idx = [6:8:last,7:8:last,8:8:last];
a(idx) = [];

More Answers (2)

Walter Roberson
Walter Roberson on 31 May 2021
a8 = reshape(a, 8, []);
a = reshape(a8(1:5,:), [], 1);
Note: Torsten's solution is more robust for the situation where the array is not an exact multiple of 8 entries.
If you have the communications toolbox, you could also use
a8 = buffer(a, 8);
a = reshape(a8(1:5,:), [], 1);
This would pad short buffers. If the missing data was in the last 3 expected entries, you would never notice the padding, but if you had a partial group of 1 to 4 elements long, then buffer() would fill out to make a full group.

Rica
Rica on 31 May 2021
Thank you everyone!

Categories

Find more on Creating and Concatenating Matrices 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!