Insert elements into vector

3 views (last 30 days)
NA
NA on 31 Oct 2020
Edited: Stephen23 on 6 Nov 2020
I have a vector 'index' and 'val_index'
index = [1;2;4;5;6;8;9];
index_val = [11;25;3;4;56;7;9];
I remove indices 3 and 7 from the 'index' . The 'removed_index' which I have is the cell array.
removed_index = {[7],[3]};
removed_val = {[1.1],[3.2]};
I want to insert removed indices and the values to the 'index'
Result should be:
index_all = [1;2;3;4;5;6;7;8;9];
index_val_all = [11;25;3.2;3;4;56;1.1;7;9];

Accepted Answer

Stephen23
Stephen23 on 31 Oct 2020
index = [1;2;4;5;6;8;9];
index_val = [11;25;3;4;56;7;9];
removed_index = [7,3]; % simpler to use a numeric array
removed_val = [1.1,3.2]; % simpler to use a numeric array
Then all you need is:
idx = [index(:);removed_index(:)];
vec = [index_val(:);removed_val(:)];
vec(idx) = vec
idx(idx) = idx
  3 Comments
NA
NA on 6 Nov 2020
Edited: NA on 6 Nov 2020
If the 'index' is something like this:
index = [1;4;5;8;9];
index_val = [11;3;4;56;7];
removed_index = [7,3]; % simpler to use a numeric array
removed_val = [1.1,3.2]; % simpler to use a numeric array
If I use the above code,
idx = [index(:);removed_index(:)];
vec = [index_val(:);removed_val(:)];
vec(idx) = vec
idx(idx) = idx
I got this result
idx =[1;4;3;4;5;7;7;8;9]
vec =[11;3;3.2;3;4;1.1;1.1;56;7];
How can I get this result
idx =[1;3;4;5;7;8;9]
vec = [11;3.2;3;4;1.1;56;7]
Stephen23
Stephen23 on 6 Nov 2020
Edited: Stephen23 on 6 Nov 2020
index = [1;4;5;8;9];
index_val = [11;3;4;56;7];
removed_index = [7,3]; % simpler to use a numeric array
removed_val = [1.1,3.2]; % simpler to use a numeric array
idx = [index(:);removed_index(:)];
vec = [index_val(:);removed_val(:)];
[idx,ids] = sort(idx); idx
idx = 7×1
1 3 4 5 7 8 9
vec = vec(ids)
vec = 7×1
11.0000 3.2000 3.0000 4.0000 1.1000 56.0000 7.0000

Sign in to comment.

More Answers (0)

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!