Effacer les filtres
Effacer les filtres

Vectorize multiple t tests across matrices

2 vues (au cours des 30 derniers jours)
Benjy Barnett
Benjy Barnett le 11 Mar 2021
I have two matrices of [18x650x650] dimensions. I would like to perform a ttest across the first dimension of these matrices at every element of the second and third dimension. So I should end up with 650*650 t tests in total. Specifically, I would like to do a t test of mat1(:,1,1) with mat2(:,1,1), followed by mat1(:,1,2) wit mat2(:,1,2) and so on.
So far I have this:
all_acc1 = rand(18,650,650);
all_acc2 = rand(18,650,650);
acc1_flat = zeros(18,650*650);
acc2_flat = zeros(18,650*650);
for subj = 1:size(all_acc1,1)
flat1 = reshape(squeeze(all_acc1(subj,:,:)).',1,[]);
flat2 = reshape(squeeze(all_acc2(subj,:,:)).',1,[]);
acc1_flat(subj,:) = flat1;
acc2_flat(subj,:) = flat2;
end
t_s = zeros(1,650*650);
p_s = zeros(1,650*650);
for i = 1:size(acc1_flat,2)
disp(i)
[h,p,ci,stats] = ttest(acc1_flat(:,i),acc2_flat(:,i));
t = stats.tstat;
t_s(i) = t;
p_s(i) = p;
end
But as you might imagine it takes several minutes to run. Is there a more efficient way to code this? Thanks!

Réponses (1)

Abdolkarim Mohammadi
Abdolkarim Mohammadi le 12 Mar 2021
ttest cannot be vectorized. I think the only speed boost left for you is to use parfor instead of for, as long as you have Parallel Computing Toolbox license.

Catégories

En savoir plus sur Loops and Conditional Statements dans Help Center et File Exchange

Produits


Version

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by