Question

我真的需要有关将多个CSV文件合并到单个文件中的帮助。第一次，我设法运行此代码：

%% Merge multiple CSV files into one CSV file
myDir = uigetdir                                                        % gets directory from any folder
d=dir(fullfile(myDir,'*.csv'));                                         % retrieve the files
fido=fopen(fullfile('finalCSVnew.csv'),'w');                            % open output file to write
for i=1:length(d)
  fidi=fopen(fullfile(myDir,d(i).name));                                % open input file
  fwrite(fido,fread(fidi,'*char'));                                     % copy to output
  fclose(fidi);                                                         % close that input file
end
fido=fclose(fido); clear fid* d                                         % close output file, remove temporaries

原来我必须更改“myDir”的命令，这样才能在一个文件夹中选择多个文件，而不是一个文件夹中需要处理的所有文件。所以我将上面的代码更改为：

%% Merge multiple CSV files into one CSV file
myDir = uigetfile('*.csv','Select the data file','MultiSelect','on');   % gets directory from any folder
d=fullfile(myDir,'*.csv');                                              % retrieve the files
fido=fopen(fullfile('finalCSVnew.csv'),'w');                            % open output file to write
for i=1:length(d)
  fidi=fopen(fullfile(myDir,d(i).name));                                % open input file
  fwrite(fido,fread(fidi,'*char'));                                     % copy to output
  fclose(fidi);                                                         % close that input file
end
fido=fclose(fido); clear fid* d                                         % close output file, remove temporaries

并且出现错误消息

来自非结构数组对象的结构内容引用。

Answer 1

您的第二个代码中存在一些错误：

如果您只选择一个文件，uigetfile会在char字符串中返回其名称，如果您选择多个文件，则会在cellarray中返回其名称，因此您必须管理它。您可以使用函数class进行检查
在致电fopen(fullfile('finalCSVnew.csv'),'w')时，您未在path的电话中提供fullfile因此似乎无用
您还必须管理中止文件选择的情况。在这种情况下，uigetfile的返回值为0

您可以采用以下方式更新代码

% Call uigetfile by specifying file name and path as output
[f_name,f_path] = uigetfile('*.txt','Select the data file','MultiSelect','on');   % gets directory from any folder
% Check for file selection abort
if(~strcmp(class(f_name),'double'))
      fido=fopen(fullfile(f_path,'finalCSVnew.txt'),'w'); % open output file to write
   % check for the number of selected files
   % if multiple file
   if(strcmp(class(f_name),'cell'))
      % Loop over the selected files
      for i=1:length(f_name)
         fidi=fopen(fullfile(f_path,f_name{i}));                                % open input file
         fwrite(fido,fread(fidi,'*char'));                                     % copy to output
         fclose(fidi);                                                         % close that input file
      end
   else
      fidi=fopen(fullfile(f_path,f_name));                                % open input file
      fwrite(fido,fread(fidi,'*char'));                                     % copy to output
      fclose(fidi);                                                         % close that input file
   end
   fido=fclose(fido); clear fid* d
else
   disp('File Selection Aborted')
end

替代解决方案

如果您只想合并某些文件，可以使用system函数调用DOS命令。

% Call uigetfile by specifying file name and path as output
[f_name,f_path] = uigetfile('*.txt','Select the data file','MultiSelect','on');   % gets directory from any folder
% Check for file selection abort
if(~strcmp(class(f_name),'double'))
   fido=fullfile(f_path,'finalCSVnew.txt'); % open output file to write
   % check for the number of selected files
   % if multiple file
   if(strcmp(class(f_name),'cell'))
      % Loop over the selected files
      for i=1:length(f_name)
         system(['type ' fullfile(f_path,f_name{i}) ' >> ' fido])
      end
   else
      system(['copy ' fullfile(f_path,f_name) ' ' fido])
   end
else
   disp('File Selection Aborted')
end

希望这有帮助，

Qapla'

使用matlab

1 个答案: