store the index of nanvalues
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi, So i got a matrix, 5 observations for 2 variables
A = 1 2
3 4
3 NaN
Nan 5
Nan 7
I wanna store the position when the value of A is a number. so for variable 1, i got values in row 1,2 and 3. for variable 2, i got values in rows 1 2 4 5
so the result of what I want is:
Answer = 1 1
2 2
3 NaN (because A(3,2) is not a number)
NaN 4
Nan 5
or
Answer 2 = 1 1
2 2
3 4
- 5
0 commentaires
Réponses (2)
Jos (10584)
le 2 Mar 2018
Modifié(e) : Jos (10584)
le 2 Mar 2018
% data
A = [ 1 2
3 4
3 NaN
NaN 5
NaN 7 ]
% engines
tf = ~isnan(A)
Answer1 = nan(size(A))
[Answer1(tf), ~] = find(tf)
Answer2 = arrayfun(@(k) find(A(:,k)), 1:size(A,2), 'un', 0)
2 commentaires
Jos (10584)
le 2 Mar 2018
Answer2 is a cell array. Each cell contains a vector with numbers. The first cell corresponds to the first column of A, and holds the rows of that column that are not NaN. Since the amount of non-NanS varies between columns, the lengths of the vectors differ between cells.
Voir également
Catégories
En savoir plus sur Matrices and Arrays dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!