I like to save a cell array into text file

Question

Majid Vaghari 2021-12-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1618155-i-like-to-save-a-cell-array-into-text-file

评论： dpb 2021-12-27

采纳的回答： dpb

Hello to all,

I have a big cell array and I like to save it into text file.

the cell array contains two columns and each colum contain name of an element for example 'Al'.

a row of the cell array is like: ['Al' 'Mg']

now I'd like to save all of rows into a text file and save it like AlMg no space between Al and Mg in the text file.

for example if in the cell array is :

Al Mg

Na k

Al Sc

in the text file:

AlMg

NaK

AlSc

I attached the Untitled.m file

if you run the program you will get the Binary which is my cell array and I like to save it into a text file like I said above.

Note that the Binary cell array is big array!

best

Majid

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Majid Vaghari 2021-12-27

my.JPG

I use MATLAB 2014b,

Please see the attachment.

best

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Answer 1

dpb 2021-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/1618155-i-like-to-save-a-cell-array-into-text-file#answer_862745

在 MATLAB Online 中打开

>> c={'Al','Mg';'Na','K'}
c =
  2×2 cell array
    {'Al'}    {'Mg'}
    {'Na'}    {'K' }
>> join(c,'')
ans =
  2×1 cell array
    {'AlMg'}
    {'NaK' }
>> 

So, the solution to your problem is

>> writecell(join(c,''),'joined.txt')

See what we got...

>> type joined.txt
AlMg
NaK
>> 

QED

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dpb 2021-12-27

在 MATLAB Online 中打开

If possible, upgrade; this is just one of the many advances since R2014. Well worth it if at all possible.

If not, then have to revert to low-level io -- still not too bad...but just a little more effort.

>> fid=fopen('joined.txt','w');
>> delete joined.txt        % get rid of old file so we know we did something new
>> for i=1:size(c,1)
    fprintf(fid,'%s\n',strcat(c{i,1},c{i,2}));
end
>> fid=fclose(fid);

and will show us the same result...

>> type joined.txt
AlMg
NaK
>> 

dpb 2021-12-27

在 MATLAB Online 中打开

Be better to put your follow-up comment as comment instead of Answer...

I would not expect any real difference in performance with the upgrade, just user convenience; it reverts to the same low-level io calls in the end, anyways.

You could see if it made any difference at all to do the concatenation first outside the loop, but I'd still expect that to be minimal. If your array is so big as to make the i/o time noticeable, then it must be quite sizable, indeed.

c=strcat(c(i,1),c(i,2));            % join cell array first
fid=fopen(...)
for i=1:size(c,1)
  fprintf(fid,'%s\n',c{i,1});
end

or, alternatively, forget about the join entirely...just a little more code in the output is why I didn't before, didn't figure the time factor would be an issue...

...
fprintf(fid,'%s\n',[c{i,}]);

or

fprintf(fid,'%s%s\n',c{i,:});

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Answer 2

Majid Vaghari 2021-12-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1618155-i-like-to-save-a-cell-array-into-text-file#answer_862795

Thanks for your answer.

I'll update my MATLAB. I have done your older solution version but it takes time for matlab to solve all the cells into one file. So, I was trying to find something faster. So, I think I should upgrade my MATLAB.

beST