Append rows to .mat file
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How do I append row(s) of data to an existing array in a .mat file. The following works except the 2nd to last line:
tableIt = [1 2 3;4 5 6;7 8 9];
tableMore = [10 11 12];
filename = 'aTable.mat';
data2store = 'tableIt';
more2store = 'tableMore';
save(filename,data2store');
whos('-file',filename);
m = matfile(filename,'Writable',true);
m.tableIt(end+1,:) = more2store;
whos('-file',filename);
4 个评论
Walter Roberson
2019-11-9
save(filename, data2store, '-v7.3');
without the -v7.3, the .mat file would typically default to -v7 and those are not writable.
Brent
2019-11-9
Walter Roberson
2019-11-9
It is recommended to not use end in this context. See https://www.mathworks.com/help/matlab/ref/matlab.io.matfile.html
Brent
2019-11-9
采纳的回答
Walter Roberson
2019-11-9
more2store = 'tableMore';
That is a 1 x 9 character vector.
tableIt = [1 2 3;4 5 6;7 8 9];
That is a 3 x 3 double.
m.tableIt(end+1,:) = more2store;
That attempts to store the 1 x 9 character vector into 3 columns of a double. That does not fit.
4 个评论
Brent
2019-11-9
Walter Roberson
2019-11-9
No, you are attempting to store the character vector 'tableMore' rather than the contents of the variable tableMore
Walter Roberson
2019-11-9
If you had done
more2store = tableMore;
then it would have worked.
Walter Roberson
2019-11-9
http://www.cs.utoronto.ca/~chechik/courses/csc324/white.html
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