call array to vectors using a for loop error problem

Hello

I wonder if someone can help me solve this problem:

I have a cell array named Spt < 1x1438 > and in each cell there is an array (64x5). If I run

Dir=Spt{1}(:,3);

I get a vector of Dir values. I would like to repeat this for each array within Spt so that I have 1438Dir vectors (e.g. Dir1, Dir2, Dir3,...Dir1438). Unfortunately when I run a loop I get an error:

for n=1:1438;
Dir(n)=Spt{n}(:,3); 
end
???  In an assignment  A(I) = B, the number of elements in B and
 I must be the same.

How do I overcome this error and generate the required Dir vectors?

Thanks in advance for any advice.

Answer 1

[Andrei Bobrov]

Dir = zeros(size(Spt{1},1),length(Spt));
for n=1:length(Spt);
Dir(:,n)=Spt{n}(:,3); 
end

or

Dir = cell2mat(cellfun(@(x)x(:,3),Spt,'UniformOutput' , false))

or more

S2 = cell2mat(Spt);
Dir = S2(:,3:5:length(Spt)*size(Spt{1},2));

[Jan]

Or use a cell array:

Dir = cell(size(Spt{1},1), 1);

for n=1:length(Spt); Dir{n}=Spt{n}(:,3); end