CELL2MAT does not support cell arrays containing cell arrays or objects

Question

Reuben Addison 2023-2-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910945-cell2mat-does-not-support-cell-arrays-containing-cell-arrays-or-objects

评论： Walter Roberson 2023-2-13

I am writing a function and it worked fine until I made a tweak it a pit then I got the above error

path1 = '/Users/punk/Documents/Data/PO3/';
path2 = '*.HWR';
direc =  struct2table(dir([fullfile(path1,path2)]));
direc = sortrows(direc,'date');
table2struct(direc);
filenames = {direc.name};
for trialnumber = 1:length(filenames);
filename = filenames{trialnumber};
data = dlmread(fullfile(path1, num2str(cell2mat(filenames(trialnumber)))),'',1,0);

But I am getting this error

Error using cell2mat

CELL2MAT does not support cell arrays containing cell arrays or objects.

Error in Complete (line 38)

data = readtable(fullfile(path1, num2str(cell2mat(filenames(trialnumber)))),'',1,0);

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Reuben Addison 2023-2-11

The are all defined in my function, I will update that in my code above

Walter Roberson 2023-2-13

You have mixed up the syntax of readtable() and dlmread() . When you use readtable(), unless the second parameter is an options object such as SpreadsheetImportOptions object, then everything after the first parameter must be name-value pairs. That might include 'NumHeaderLines' option -- but more likely considering you are using dlmread() is that your first row is headers, and you probably do not want to skip those when you readtable() as the header supplies the variable names.

Also, your filename is already a character vector; why are you using num2str() with it?

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Answer 1

Jan 2023-2-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1910945-cell2mat-does-not-support-cell-arrays-containing-cell-arrays-or-objects#answer_1169490

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table2struct(direc);

This line converts the table direc to a struct, but ignores the result. In consequence this line has no effect.

Simplify your code by avoiding the useless conversion to table and back again:

path1 = '/Users/punk/Documents/Data/PO3/';
path2 = '*.HWR';
direc = dir(fullfile(path1, path2)));  % No need for a concatenation with []
[~, idx] = sort([direc.datenum]);
direc = direc(index);