change only those zeros to NaN if all in row are 0

4 visualizzazioni (ultimi 30 giorni)
I have
a =
1 2 3
0 0 0
2 1 0
4 5 0
0 0 0
2 0 1
I need
b =
1 2 3
NaN NaN NaN
2 1 0
4 5 0
NaN NaN NaN
2 0 1
i.e. only if all elements in row are 0 replace with NaN

Risposta accettata

Thomas
Thomas il 6 Giu 2012
a(any(a,2)==0,:)=NaN;
b=a
  3 Commenti
per isakson
per isakson il 6 Giu 2012
Shouldn't that be *all*:
b( all(b, 2) == 0, :) = NaN
Image Analyst
Image Analyst il 6 Giu 2012
It works because any() looks for non-zeros, so it's only zero if there are no non-zeros, in other words, if they are all zeros. Perhaps my answer (not my comment above) might be more intuitive though - it used all().

Accedi per commentare.

Più risposte (1)

Image Analyst
Image Analyst il 6 Giu 2012
% Make a copy so we don't change a.
b=a
% Find out which rows are all zeros.
nonZeroRows = all(b == 0, 2)
% Assign all columns of the all-zero rows to nans.
b(nonZeroRows, :) = NaN

Prodotti

Community Treasure Hunt

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

Start Hunting!

Translated by