MATLAB：向 csv 文件添加新行

Question

Pretty straightforward in theory, but ridiculously complex in practice? Or I am missing something obvious?

I import my file file.csv . It is simply 10 empty columns named col1 to col10 (0x10 empty table)

file = readtable('~/.../file.csv');

Here is the new row I want to add to this file

newline = {'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten'};

Now I want to add this row to file and write it back to csv.

Solution 1 I have tried

Add the line with

file = [file; newline];

Then write file to csv, with:

csvwrite('~/.../out.csv',file);

Nope.

Error using csvwrite (line 47) Undefined function 'real' for input arguments of type 'table'.

Or perhaps

writetable('~/Dropbox/phd/sleepAnalysis/database/out.csv',file);

Nope.

Error using writetable (line 124) Input must be a row vector of characters or string scalar.

Solution 2 I have tried

Just add the new line while writing the file

dlmwrite('~/.../out.csv',newline,'-append','delimiter',',');

It does write the file, but it adds one column per character to the left. Obviously not what I am (or anyone really) after here.

How it looks:

Can't possibly be this hard? Can you help?

Answer 1

"writetable" is the right solution. You just need to put the table first and the file name second.

    file = table([],[],[],[],[],[],[],[],[],[],'VariableNames',{'col1','col2','col3','col4','col5','col6','col7','col8','col9','col10'})
    newline = {'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten'};
    file = [file ; newline]
    writetable(file,'out.csv')