How can I merge 3 matrices into one and skip some variables?

I have 3 matrices(size 178x1) and I want to merge them into 1 matrix BUT I want to skip rows numbered 48 to 59 and 108 to 130. Seems my code isn't doing the work.

   for i=1:178
    if i==49
        i=60
    end
    if i==108
        i=131
    end
    Wines=[TotalPhelons(:,i), Flavanoids(:,i), NonflavanoidPhenols(:,i)];
  end

What I get is a matrix 178x3. And I get this error :

Index exceeds matrix dimensions. Error in ThirdStep (line 15) Wines=[TotalPhelons(:,i), Flavanoids(:,i), NonflavanoidPhenols(:,i)];

EDIT: I want the new matrix to have 3 collumns (each collumn for each matrix)

[Stephen23]

It is not possible to use that syntax to "skip" loop iterations. If you wish to use a for loop and "skip" iterations then you need to specify this as the for loop input:

for k = [1:47,60:107,131:178]
  ...
end

Note that this will still not give you what you want, because the output matrix will be indexed at the same rows as the input matrix, and so will be the same size (it will fill the intermediate rows with zeros). You could loop over a separate vector of indices... but really the best solution is to forget about ugly loops and learn to write efficient MATLAB code without loops.

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

Answer 1

[Stephen23]

Doing this in a loop is very inefficient. You should do this all at once using indexing:

 idx = [1:47,60:107,131:178];
 out = [TotalPhelons(idx), Flavanoids(idx), NonflavanoidPhenols(idx)]

[Iraklis S]

Oh thank you very much Stephen!! I'll keep it in mind :)

[Iraklis S]

I still get an Index exceeds matrix dimensions. error even though I end up with a 178x3 out matrix. Shouldn't I get a matrix with size 144x3??