Reading a txt file

Question

KatherineS 2019-6-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/465847-reading-a-txt-file

编辑： KatherineS 2019-6-7

Hello, I am trying to get MATLAB to read this file and to import all the values as variables and ignore the lines starting with # and $. However everything I try fails to do this.

# Comments start with #, the rest of the line is ignored

# new section headings start with $

#--------------------------------------------------

$ 1 Simulation parameters

x = t45 # id

y = 20120907 # random number

z = 0.0 # time / s

...

#--------------------------------------------------

$ 2 Orbit parameters

# inc = 0.001 # inclination

# ecc = 0.01 # eccentricity

...

I have tried the code below and many other methods.

Thank you in advance for your help.

fid = fopen('file', 'rt');
filepos = 0;
tline = fgetl(fid);
while ~isempty(tline) && any(strncmp(tline, {'#', '$'}))
   filepos = ftell(fid);
   tline = fgetl(fid);
end
fseek(fid, filepos, 'bof');
C = textread(fid, '%s' , 'Delimiter', ';');
fclose(fid);

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Answer 1

Jan 2019-6-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/465847-reading-a-txt-file#answer_378130

编辑：Jan 2019-6-6

在 MATLAB Online 中打开

S = fileread('filename');
C = strsplit(S, char(10));
C(strncmp(C, '$'), 1) = [];
C(strncmp(C, '#'), 1) = [];
C = strtok(C, '#');  % remove trailing comments
Data = struct([]);
for iC = 1:numel(iC)
    L           = strsplit(C{iC}, '=');
    Data.(L{1}) = L{2};
end

Maybe you want to convert everything, which looks like a number to a number?

Data = struct([]);
for iC = 1:numel(iC)
    L     = strsplit(C{iC}, '=');
    Value = str2double(L{2});
    if isnan(Value)  % No valid convertsion to a number
        Data.(L{1}) = L{2};
    else
        Data.(L{1}) = Value;
    end
end