import multiple csv files in matlab
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Mar
el 25 de Jul. de 2018
Comentada: Mar
el 26 de Jul. de 2018
I am trying to import several csv files and compact all of them in a single variable called "data".
The csv files are 2D images (files include only numbers - no headers. I want to make a stack of these 2D images and create a 3D volume. All images have the same x- and y-dimension (i.e. same number of columns and rows).
I came across with this post https://uk.mathworks.com/matlabcentral/answers/129127-how-do-i-import-csv-files-using-csvread
Below it's the code I used:
d=dir('/Users/Desktop/csv/2Dimage_*.clv');
n=length(d);
data=cell(1,n);
for i=1:n
data(i)=csvread(d(i).name);
end
data=cell2mat(data);
I tried to check the dimensions of the data but I don't get what I expected. I was expecting a 3D array but I got the following
ans =
0 0
Can someone help with this please?
1 comentario
Guillaume
el 25 de Jul. de 2018
Editada: Guillaume
el 25 de Jul. de 2018
The code you've written will not produce a 3D array, only a 2D array of images stacked horizontally. That is trivially fixed however.
More troubling is that your result would imply that data is completely empty and hence that nothing was read. How did you "check the dimensions of the data"?
Respuesta aceptada
Guillaume
el 25 de Jul. de 2018
Editada: Guillaume
el 26 de Jul. de 2018
A simpler version of your code, that will produce a 3D array instead of stacking the images horizontally:
folder = ''/Users/Desktop/csv';
dircontent = dir(fullfile(folder, '2Dimage_*.csv');
images = arrayfun(@(f) csvread(fullfile(folder, f.name)), dircontent, 'UniformOutput', false);
image = cat(3, images{:}); %assumes all images are the same size. Otherwise will error
6 comentarios
Stephen23
el 26 de Jul. de 2018
Editada: Stephen23
el 26 de Jul. de 2018
@Mar: download and use my FEX submission natsortfiles. Its online documentation, the HTML help, and Mfile help all contain plenty of examples. Probably you would put the names into a cell array:
names = natsortfiles({dircontent.name});
images = cellfun(@(name) csvread(fullfile(folder, name)), names, 'Uni',0);
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