Matrix inserted within a matrix element
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi, I'm looking for help replacing an element of a matrix with a new matrix. I have a large matrix where i wish to replace every element with a 1x3 row vector, is this possible? If not you may be able to suggest a different approach. Essentially i wish for every element in a matrix to contain the values for a spherical polar vector. So a value for r, theta and phi. Is there a better way to do this, short of making the original vector 3 times as long, as this causes problems in addressing the entries. Thanks Andy
0 commentaires
Réponses (1)
Image Analyst
le 7 Avr 2012
So just add a third dimension
m=rand(5,5) % Create sample data.
% Now we want three numbers at each location insted of 1.
% So add a dimension with 2 more planes
blankPlane = zeros(size(m))
m = cat(3, m, blankPlane, blankPlane)
% Assign a 1x3 row vector to the 1,1 location
rowVector = [1 2 3] % Create row vector.
m(1,1,:) = rowVector;
% Let's do it again at the 3,3 location.
rowVector = [10 20 30] % Create row vector.
m(3,3,:) = rowVector
You might have t in plane 1 m(:,:,1), theta might be in plane 2 m(:,:,2), and you might have phi in plane 3 m(:,:,3), or however you want to do it.
0 commentaires
Voir également
Catégories
En savoir plus sur Statistics and Machine Learning Toolbox 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!