Matlab：如何使用`sscanf`讀取包含小數的數字？

Question

我想閱讀下列格式重演文件（但我已經切出的數據甚至因爲過長的第一次重複）：

1.00 'day' 2011-01-02 
'Total Velocity Magnitude RC - Matrix' 'm/day' 
    0.190189  0.279141  0.452853  0.61355  0.757833  0.884577 
    0.994502  1.08952  1.17203  1.24442  1.30872  1.36653 
    1.41897  1.46675  1.51035  1.55003  1.58595  1.61824 

這是原來的file

在一些數據文件中，我有十進制數字的日子。在這種情況下，我只是得到小數點前的數字，沒有小數。我正在使用下面顯示的代碼來讀取和存儲。 如何在days中包含小數部分？比如我想days存儲的2.2，而不是僅僅2

fid = fopen(file_name); % open the file 

dotTXT_fileContents = textscan(fid,'%s','Delimiter','\n'); % read it as string ('%s') into one big array, row by row 
dotTXT_fileContents = dotTXT_fileContents{1}; 
fclose(fid); %# don't forget to close the file again 
% str2match = '''Total Velocity Magnitude RC - Matrix'' ''m/day'''; 

%# find rows containing 'Total Velocity Magnitude RC - Matrix' 'm/day' 
data_starts = strmatch(str2match,... 
    dotTXT_fileContents); % data_starts contains the line numbers wherever 'Total Velocity Magnitude RC - Matrix' 'm/day' is found 
nDataRows=data_starts(2)-data_starts(1); 
ndata = length(data_starts); % total no. of data values will be equal to the corresponding no. of '** K' read from the .txt file 

%# loop through the file and read the numeric data 
for w = 1:ndata 
    %# read lines containing numbers 
    tmp_str = dotTXT_fileContents(data_starts(w):data_starts(w)+nDataRows-2); % stores the content from file dotTXT_fileContents of the rows following the row containing 'Total Velocity Magnitude RC - Matrix' 'm/day' in form of string 
    %# convert strings to numbers 
    y = cell2mat(cellfun(@(z) sscanf(z,'%f'),tmp_str,'UniformOutput',false)); % store the content of the string which contains data in form of a character 
    %# assign output 
    data_matrix_column_wise(:,w) = y; % convert the part of the character containing data into number 

    %# reading date in days passed since beginning of simulation 
    days_str = dotTXT_fileContents(data_starts(w)-1); 
    days_str = days_str{1}; 
    days(w) = sscanf(days_str, '%d'); 
end 

Answer 1

行更改days(w) = sscanf(days_str, '%d');排隊days(w) = sscanf(days_str, '%f');

Answer 2

這讓多一點的時間比我所期待的。您可能想以不同的方式讀入文件。下面的代碼處理由行文件中的行，這樣在while循環結束時，您有daynum在其數據allnums佈局：

filename = 'single_phase_flow.txt'; 
fid = fopen(filename); 

while 1 
    % first line: 1.00 'day' 2011-01-02 
    tline = fgetl(fid); 
    if ~ischar(tline), break, end; 
    strs = regexp(tline, '\s', 'split'); 

    daynum = sscanf(strs{1}, '%f'); 
    daystr = strs{2}; 
    datestr = strs{3}; 

    % second line: 'Total Velocity Magnitude RC - Matrix' 'm/day' 
    tline = fgetl(fid); 
    if ~ischar(tline), break, end; 
    if (~regexp(tline, 'Total Velocity')) 
     disp('expected Total Velocity line'); 
     break; 
    end 

    % now read in numbers until we get to a blank line 
    allnums = []; 
    gotline = 1; 
    while gotline 
     tline = fgetl(fid); 
     if ~ischar(tline) 
      gotline = NaN; 
     end 
     if (length(tline) == 0) 
      gotline = 0; 
     else 
      % read in more numbers (not especially efficient) 
      nums = sscanf(tline, '%f'); 
      allnums = [allnums; nums]; 
     end 
    end 

    % here is the data, you'll need to put it somewhere yourself now 
    disp(daynum); 
    disp(length(allnums)); 
end 

fclose(fid);