如何将 Matlab 变量转换为带有标题的 .dat（文本）文件

Question

已编辑问题：

我在名为 avg_data_models 的变量中有 2500 行 x 100 列数据。我还有 2500 行 x 100 列变量“X”和类似大小的矩阵变量“Y”，两者都包含坐标。我想将此变量的值保存在文本 (.dat) 文件中，该文件必须以下列方式包含 302 个标题行：

avg_data_models
300
X_1
X_2
.
.
.
X_100
Y_1
Y_2
.
.
.
Y_100
avg_data_models_1
avg_data_models_2
avg_data_models_3
.
.
.
.
.
avg_data_models_100

在上面的标题样式中，第一行是文件名，第二行告诉列数（每列有2500行），剩下的300行分别代表每个变量的模型——比如 100 个 X 模型、100 个 Y 模型和 100 个 avg_data_models 模型。

Answer 1

考虑这段代码：

%# here you have your data X/Y/..
%#X = rand(2500,100);

[r c] = size(X);
prefixX = 'X';
prefixY = 'Y';
prefixData = 'avg_data_models';

%# build a cell array that contains all the header lines
num = strtrim( cellstr(num2str((1:c)','_%d')) );   %#' SO fix
headers = [ prefixData ;
            num2str(3*c) ;
            strcat(prefixX,num) ;
            strcat(prefixY,num) ;
            strcat(prefixData,num) ];

%# write to file
fid = fopen('outputFile.dat', 'wt');
fprintf(fid, '%s\n',headers{:});
fclose(fid);

---

编辑

似乎我误解了这个问题。这是编写实际数据的代码（不是标题！）：

%# here you have your data X/Y/..
avg_data_models = rand(2500,100);
X = rand(2500,100);
Y = rand(2500,100);

%# create file, and write the title and number of columns
fid = fopen('outputFile.dat', 'wt');
fprintf(fid, '%s\n%d\n', 'avg_data_models', 3*size(X,2));
fclose(fid);

%# append rest of data
dlmwrite('outputFile.dat', [X Y avg_data_models], '-append', 'delimiter',',')

注意：我使用逗号,作为分隔符，如果你愿意，你可以将其更改为空格或制表符\t..

Answer 2

您可以使用fprintf 来编写标题，如下所示：

%# define the number of data
nModels = 100;
dataName = 'avg_data_models';

%# open the file
fid = fopen('output.dat','w');

%# start writing. First line: title
fprintf(fid,'%s\n',dataName); %# don't forget \n for newline. Use \n\r if yow want to open this in notepad

%# write number of models
fprintf(fid,'%i\n',nModels)

%# loop to write the rest of the header
for iModel = 1:nModels
fprintf(fid,'%s_%i\n',dataName,iModel);
end

%# use your favorite method to write the rest of the data. 
%# for example, you could use fprintf again, using /t to add tabs 
%# create format-string
%# check the help to fprintf to learn about formatting details
formatString = repmat('%f\t',1,100);
formatString = [formatString(1:end-1),'n']; %# replace last tab with newline

%# transpose the array, because fprintf reshapes the array to a vector and 
%# 'fills' the format-strings sequentially until it runs out of data
fprintf(fid,formatString,avg_data'); %'# SO formatting

%# close the file
fclose(fid);