How to put different size vectors to one matrix or mat file?

Question

Djordje Damnjanovic 2024-3-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2094191-how-to-put-different-size-vectors-to-one-matrix-or-mat-file

回答： Djordje Damnjanovic 2024-3-14

Hello everybody, I need help.

After processing some signals I obtain different size vectors that I need to put in one place, and by that I mean one matrix or matfile etc. For example, results are:

d1=1 2 3 4 5 6 7 8

d2=1 2 3 4 5

d3=1 2 3

d4=1

So, I need to combine them into one matrix (or matfile) like this:

d5 =1 2 3 4 5 6 7 8

1 2 3 4 5

1 2 3

1

What I also need is to put ''d5'' to txt file with ";"' at the end of each row. like this:

1 2 3 4 5 6 7 8;

1 2 3 4 5;

1 2 3 ;

1;

Thanks a lot for all suggestions.

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Answer 1

Matt J 2024-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/2094191-how-to-put-different-size-vectors-to-one-matrix-or-mat-file#answer_1424961

编辑：Matt J 2024-3-14

在 MATLAB Online 中打开

To save to a .mat file

save filename d1 d2 d3 d4

To retrieve them, packaged in a struct variable,

S=load('filename');

To write to a text file,

 d={1:8;1:5;1:3;1}; d(:,end)={';'}
 
 for i=1:height(d), writecell(d(i,:), 'outfile.txt', Delim=' ',WriteMode='append'); end

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Djordje Damnjanovic 2024-3-14

Thank You very much Matt! his was very helpfull!

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Answer 2

Chunru 2024-3-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2094191-how-to-put-different-size-vectors-to-one-matrix-or-mat-file#answer_1424966

在 MATLAB Online 中打开

d1=[1 2 3 4 5 6 7 8];
d2=[1 2 3 4 5];
d3=[1 2 3];
d4=1;
% Use cell array
d5 ={d1; d2; d3; d4}
d5 = 4×1 cell array
    {[1 2 3 4 5 6 7 8]}
    {[      1 2 3 4 5]}
    {[          1 2 3]}
    {[              1]}
% you can save d5 as a mat file
save d5.mat d5
dir
.       ..      d5.mat  
% write the data into a text file
fid = fopen("result.txt", "wt");
for i=1:length(d5)
    fprintf(fid, "  %d", d5{i});
    fprintf(fid,";\n");
end
fclose(fid);
type result.txt
  1  2  3  4  5  6  7  8;
  1  2  3  4  5;
  1  2  3;
  1;