# Looping through a 3D matrix

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Robert on 4 Nov 2015
Commented: TastyPastry on 5 Nov 2015
I have a 3D matrix 35,43,144
I want to run the following code such that it performs the function element by element through the 3rd dimension (using 144 data points) I want this to be done for every pixel giving me 1505 outputs (35x43)
I just can't seem to figure out the correct loop inputs
GRACE = p.datamean
ncol = size(GRACE,2);
for k = 1:144
j = 1:43
i = 1:35
[c,l] = wavedec(GRACE(i,j,k),4,'dmey');
al = appcoef(c,l,'dmey',1);
%[cD1,cD2,cD3,cD4,cD5,cD6] = detcoef(c,l,[1,2,3,4,5,6]);
D = [];
%D(:,6)= wrcoef('a',c,l,'dmey',6);
%D(:,5) = wrcoef('a',c,l,'dmey',5);
D(:,4) = wrcoef('a',c,l,'dmey',4);
D(:,3) = wrcoef('a',c,l,'dmey',3);
D(:,2) = wrcoef('a',c,l,'dmey',2);
D(:,1) = wrcoef('a',c,l,'dmey',1);
filename = sprintf('%s_%04f.txt', 'GRACE_APROXIMATIONS', k)
csvwrite(filename,D)
end

TastyPastry on 4 Nov 2015
for i = 1:144
for j = 1:43
for k = 1:35
myVal = myData(i,j,k);
%do something
end
end
end
##### 2 CommentsShowHide 1 older comment
TastyPastry on 5 Nov 2015
You could declare a tracking variable outside the entire loop and increment it each time you print a file.

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