Reduce dimension of a vector

Hello at the beginning of my code i declare a vector

riga_save=save_rig;

where save_rig is 1x14. after some works on the indices at the end of my code i find this:

riga_save =

     2     3     9    10    11    15     0     0     0     0     0     0     0     0

in my code i go to put all zeros in riga_save at the beginning and then i go to replace these zeros with some indices of save_rig...so at the end i find all these 000 given by the oversized, since the vector save_rig is bigger then riga_save. how can i remove the 0 0 0 given by the oversized?

thank you

Answer 1

[Salvatore Turino]

i've done this:

   app_save=riga_save;
  clear riga_save

for i=1:length(colonna_save)

riga_save(i)=app_save(i);

end

i want to know if there is something with more efficiency.

Answer 2

[Andrew Newell]

I would use find inside riga_save to extract the nonzero indices.

It may be more efficient, though, to have save_rig return logical indices (see Logical indexing).

However, to answer the question you actually asked, you can do this:

riga_save = riga_save(riga_save>0);

This is also an example of logical indexing!

(EDITED to correct answer)

[Salvatore Turino]

it doesn't work. i need to remove the 0.