file - 如何在 MATLAB 中将数据保存在 .txt 文件中

Question

我有 3 个 txt 文件 s1.txt, s2.txt, s3.txt。每个文件都有相同的格式和数据数量。我只想合并这 3 个文件的第二列文件合并为一个文件。在合并数据之前，我根据第一列对其进行了排序:

未排序的文件: s1.txt s2.txt s3.txt

1 23     2 33    3 22 
4 32     4 32    2 11
5 22     1 10    5 28
2 55     8 11    7 11

排序后的文件: s1.txt s2.txt s3.txt

1 23     1 10    2 11 
2 55     2 33    3 22
4 32     4 32    5 28
5 22     8 11    7 11

这是我目前的代码:

BaseFile ='s'
n=3
fid=fopen('RT.txt','w');
for i=1:n
  %Open each file consecutively 
  d(i)=fopen([BaseFile num2str(i)'.txt']);

  %read data from file
  A=textscan(d(i),'%f%f')
  a=A{1}
  b=A{2}
  ab=[a,b];

  %sort the data according to the 1st column
  B=sortrows(ab,1);

  %delete the 1st column after being sorted
  B(:,1)=[]

  %write to a new file
  fprintf(fid,'%d\n',B');

  %close (d(i));

  end    
fclose(fid);

如何以这种格式在新的 txt 文件中获取输出？

23 10 11 
55 33 22
32 32 28
22 11 11

而不是这种格式？

23    
55    
32   
22
10    
33
32
11
11
22
28
11

Answer 1

先创建输出矩阵，再写入文件。

这是新代码:

BaseFile ='s';
n=3;
for i=1:n % it's not recommended to use i or j as variables, since they used in complex math, but I'll leave it up to you

    % Open each file consecutively
    d=fopen([BaseFile num2str(i) '.txt']);

    % read data from file
    A=textscan(d,'%f%f', 'CollectOutput',1);

    % sort the data according to the 1st column
    B=sortrows(A{:},1);

    % Instead of deleting a column create new matrix
    if(i==1)
        C = zeros(size(B,1),n);
    end

    % Check input file and save the 2nd column
    if size(B,1) ~= size(C,1)
        error('Input files have different number of rows');
    end
    C(:,i) = B(:,2);

    % don't write yet
    fclose (d);

end

% write to a new file
fid=fopen('RT.txt','w');
for k=1:size(C,1)
    fprintf(fid, [repmat('%d\t',1,n-1) '%d\n'], C(k,:));
end
fclose(fid);

编辑: 实际上，只将数字写入文件不需要 FPRINTF。使用 DLMWRITE相反:

dlmwrite('RT.txt',C,'\t')