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Reduce dimension of a vector

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Salvatore Turino
Salvatore Turino 2012-1-23
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

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采纳的回答

Salvatore Turino
Salvatore Turino 2012-1-23
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.

更多回答（1 个）

Andrew Newell
Andrew Newell 2012-1-23
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)

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