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Load data from mat files to a matrix

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Laura Gabriela
Laura Gabriela on 20 Nov 2019
Answered: Stephen23 on 20 Nov 2019
Hello! I have 50 .mat files and each of them has 4 structures inside. I want to take from .mat file the structure named ' Data'.
In this 'Data' structure, there are 4 columns. i need the last column from each data file, from each .mat file and load it in an empty matrix
for ex: 1.mat ->Numbers, Files, Names and Data -> Data = [1 2 3
4 5 6
7 8 9] -> i need the column 3 6 9 to load into a matrix in matlab as a row of it. And fill the matrix with the last columns of each data file.
Matrix=[Data1.1 Data1.2 Data1.3 ; Data2.1 Data2.2 Data2.3 ; .... ; Data50.1 Data50.2 Data50.3]
Do you know if i can do that?

Answers (2)

JESUS DAVID ARIZA ROYETH
JESUS DAVID ARIZA ROYETH on 20 Nov 2019
if your data is called 1.mat, 2.mat, 3.mat and so on, and in addition each of these data contains a structure called "Data" and in this same structure there is a field called "Data" and in this field There is a matrix of which you want the last column, so the solution is as follows:
matrix=[];
for k=1:50
dd=load(num2str(k,'%i.mat'));
matrix=[matrix dd.Data.Data(:,end)];
end
disp(matrix)
Espero te sea de ayuda y sea la solución de tu requerimiento

Stephen23
Stephen23 on 20 Nov 2019
N = 50;
C = cell(1,N);
for k = 1:N
F = sprintf('%d.mat',k);
S = load(F);
C{k} = S.Data(:,3);
end
M = [C{:}]
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