import multiple csv files in matlab
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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 个评论
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"?
采纳的回答
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 个评论
Mar
2018-7-25
Guillaume
2018-7-26
Well, looking for files with extension clv or files with extension csv is of course not going to return the same set of files.
The error is because csvread needs to look for the files in the correct folder rather than the current one. I overlooked that. It's easily fixed. Answer updated.
Mar
2018-7-26
@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);
Mar
2018-7-26
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