How to read text file and put it in to a matrix format.

Question

Jothi 2012-11-9

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https://ww2.mathworks.cn/matlabcentral/answers/53275-how-to-read-text-file-and-put-it-in-to-a-matrix-format

采纳的回答： Azzi Abdelmalek

在 MATLAB Online 中打开

My input file input.txt has the following inputs.

input.txt=

a b c d f

a c

a c d f g

a b e h

a c e f

I want input file converted into a matrix format ie.,

input=

[a b c d f

 a c 0 0 0
 a c d f g
 a b e h 0
 a c e f 0];

how will do this.

thanks.

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Answer 1

Azzi Abdelmalek 2012-11-9

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fid = fopen('file1.txt');
line1 = fgetl(fid);
res=line1;
while ischar(line1)
line1 = fgetl(fid);
res =char(res,line1)
end
fclose(fid);

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Azzi Abdelmalek 2012-11-9

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To add 0

[n,m]=size(res)
for k1=1:2:n
  for k2=1:2:m
      if isequal(res(k1,k2),' ')
          res(k1,k2)='0'
      end
  end
end

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Answer 2

David Barry 2012-11-9

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You should try looking up the functions textread and textscan if you want to do this programatically. Alternatively you can use the data import wizard GUI.

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David Barry 2012-11-9

uiimport will open the wizard or it can be found from the menus.

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Answer 3

Andrei Bobrov 2012-11-9

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https://ww2.mathworks.cn/matlabcentral/answers/53275-how-to-read-text-file-and-put-it-in-to-a-matrix-format#answer_64871

编辑：Andrei Bobrov 2012-11-9

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f = fopen('test.txt'); c = textscan(f,'%s','Delimiter','\n');fclose(f);
c2 = c{1}(~cellfun(@isempty,c{1}))
c3 = regexp(c2,'\w*','match')
n = cellfun('size',c3,2);
m = max(n);
c4 = arrayfun(@(x,y)[c3{x},repmat({0},1,mod(-y,m))],(1:numel(n))',n(:),'un',0);
test = cat(1,c4{:});

or

fid = fopen('test.txt');
C = textscan(fid, '%s %s %s %s  %s');
fclose(fid);
n = cellfun(@numel,C);
m = max(n);
C1 = cellfun(@(x,y)[x;repmat({'0'},mod(-y,m),1)],C,num2cell(n),'un',0)
Cout = [C1{:}]
Cout(cellfun(@isempty,Cout)) = {'0'}