# How to extract value from cell, then from matrix?

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I G il 16 Gen 2019
Modificato: Andrei Bobrov il 16 Gen 2019
I have data stored in p, as 1x41 cell. For me it is necessary to extract every value in cell, every 101x4 double as matrix and then to extract exact value from that matrix. My code is:
beta=1:0.1:5;
for i=1:length(beta)
a=p{[1,i]};
p0(i,1)=a(101,1);
p1(i,1)=a(101,2);
p2(i,1)=a(101,3);
p3(i,1)=a(101,4);
end
where length(beta)=41, because of that, p is 1x41 cell. Line a=p{[1,i]}; give me every matrix in dimensions 101x4. And then is necessary to store every value on position a(101,1) in p0. At the and p0 need to has dimension 41x1, and I got it, but with all the same values? p is not consisted of all the same values, so I cannot se my mistake? It is like for loop does not work.
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### Risposta accettata

Andrei Bobrov il 16 Gen 2019
Modificato: Andrei Bobrov il 16 Gen 2019
B = cat(3,p{:});
p0_3 = num2cell(squeeze(B(end,:,:)).',1);
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Andrei Bobrov il 16 Gen 2019
Modificato: Andrei Bobrov il 16 Gen 2019

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