How to solve Reference to non-existent field 'folder'.

I have a coding like this

folder='D:\\MultiLinierRegression\OutputRd'

fils=dir([folder '\*.txt']); % lists all the files with a .txt extension in myfolder

[~,idx]=sort({fils.name}); % index to load .txt files alphabetically

temp=importdata([fils(idx(1)).folder '\' fils(idx(1)).name]); % read A.txt

Y=temp(:,1); X=temp(:,2:end);

for ii=idx(2:end)

temp=importdata([fils(ii).folder '\' fils(ii).name]);

X =[X temp(:,2:end)];

end

But I got a message like this

Reference to non-existent field 'folder'.

Error in CalcRdAll (line 8)

temp=importdata([fils(idx(1)).folder '\' fils(idx(1)).name]); % read A.txt

Is there any one can help?

Answer 1

[Stephen23]

The folder field (and recursive folder searching) was added in R2016b.

As you are not using the recursive folder search you can simply do this:

D = 'D:\\MultiLinierRegression\OutputRd'
S = dir(fullfile(D,'*.txt'));
[~,idx] = sort({S.name}); % index to load .txt files alphabetically 
temp = importdata(fullfile(D,S(1).name));
Y = temp(:,1);
X = temp(:,2:end);
for ii = idx(2:end)
    temp = importdata(fullfile(D,S(ii).name));
    X = [X,temp(:,2:end)];
end

[Skydriver]

Thank you with your respond,

But in my coding I got the massage like this

Error using horzcat

The following error occurred converting from double to struct:

Conversion to struct from double is not possible.

Error in CalcAll (line 14)

X = [X,temp(:,2:end)];

[Stephen23]

Apparently your file data do not all have the same sizes. You can avoid this error by importing into a cell array or a structure, e.g.:

D = 'D:\\MultiLinierRegression\OutputRd'
S = dir(fullfile(D,'*.txt'));
for ii = 1:numel(S)
    S(ii).data = importdata(fullfile(D,S(ii).name));
end

After the loop you can investigate the sizes, adjust the sizes, and concatenate if possible.