Saving some part of a cell array

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Yongmin 2015-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/179652-saving-some-part-of-a-cell-array

评论： Yongmin 2015-3-2

采纳的回答： Titus Edelhofer

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Hello,

I have a 1x11 cell and want to save some columns of the cell (from 1st column to 8th column only) into a MAT-file.

data = 
    columns 1 through 4
      [21350235x8 char]  [21350235x6 char] [21350235x6 char] [21350235x1 int32]
    columns 5 through 8
      [21350235x64 char]  [21350235x10 char] [21350235x1 int32] [21350235x1 int32]
    columns 9 through 11
      {21350235x1 cell}  {21350235x1 cell} {21350235x1 cell}

Columns 9 ~ 11 consist of character strings of variable lengths containing unicode texts. If I try to save them in MAT-file, MATLAB requires to use -v7.3 switch. The saved MAT file has too large size, I want eliminate columns 9 through 11 instead.

Could you please tell me how to do it?

Many thanks!

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Titus Edelhofer 2015-2-24

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There was a typo in Geoff's comment, it should be

data = data(1:8);

instead.

Titus

Yongmin 2015-2-24

Thanks Geoff and Titus. I tried to accessing each element of the cell by data{1}, data{2}, and so on. Anyhow your comment were very helpful.

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采纳的回答

Titus Edelhofer 2015-2-24

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Hi,

you should be able to index into data without destroying data or doing copies:

dataTruncated = data(1:8);
save someFile.mat dataTruncated

If you prefer to have the data in the file called "data", then cut of the last cells as Geoff suggested and then save ...

Titus

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Titus Edelhofer 2015-2-25

Hi,

what I would do is to write two small helper functions "myload" and "mysave", that e.g. saves individual entries of your cell array to individual .mat files (maybe zip them together if you prefer to have one file), and for load to the opposite of reading the individual files.

Titus

Yongmin 2015-3-2