exclude some elements in array

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

Answer 1

[Torsten]

last = numel(a);
idx = [6:8:last,7:8:last,8:8:last];
a(idx) = [];

Answer 2

[Walter Roberson]

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.

Answer 3

[Rica]

Thank you everyone!