delete consecutive commas in txt file

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george korris
george korris 2022-9-12
评论： george korris 2022-9-13
I have the next txt file that has more than one ',' between numbers and i only want 1 comma between my numbers
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
0.00443747926701899,0.0415007916135113,0.0507606123682882,,0.118547629187242,,,,,,,,,0.300291185258514,,,,,,,,,,,,,,,,,,,,0.410219670837715,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0.698099828162265
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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Stephen23
Stephen23 2022-9-12
What should happen with lines that only contain commas: do you want to keep them, or remove them?

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Star Strider
Star Strider 2022-9-12
编辑：Star Strider 2022-9-12
Ran in:
Use readmatrix with additional name-value pair arguments to select the delimiter and combine multiple consecutive delimiters. See the documentation section on Text Files Only for details on these and other Name-Value Arguments.
M1 = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1122645/ca.txt', 'Delimiter',',', 'ConsecutiveDelimitersRule','join', 'LeadingDelimitersRule','ignore')
M1 = 8×9
0.0044 0.0415 0.0508 0.1185 0.1397 0.2522 0.3003 0.4102 0.6981 0.0361 0.1039 0.1559 0.1819 0.2685 0.4436 0.5813 0.8723 1.2182 0.0766 0.2214 0.2013 0.3533 0.5310 0.9182 1.1550 1.4976 1.9698 0.0721 0.5354 0.6176 0.6157 1.2760 1.7109 1.9629 2.4014 2.9319 0.2162 0.2679 1.3769 1.7134 2.1104 2.6804 3.0724 3.2769 4.0396 1.4989 1.6092 2.2079 2.4976 2.7068 3.8842 3.8599 4.3714 4.6691 1.7589 2.4418 2.3176 3.3207 3.0543 4.3723 4.3590 4.6367 4.8807 0.1454 2.1400 2.5672 3.5504 3.3989 4.4617 4.5724 5.0063 4.9371
.
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更多回答（2 个）

Simon Chan
Simon Chan 2022-9-12
Ran in:
May be this:
rawdata = readlines('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1122645/ca.txt');
iwant = [];
for k = 1:length(rawdata)
data = str2double(strsplit(rawdata{k},','));
if ~all(isnan(data))
iwant = [iwant;data];
end
end
iwant
iwant = 8×9
0.0044 0.0415 0.0508 0.1185 0.1397 0.2522 0.3003 0.4102 0.6981 0.0361 0.1039 0.1559 0.1819 0.2685 0.4436 0.5813 0.8723 1.2182 0.0766 0.2214 0.2013 0.3533 0.5310 0.9182 1.1550 1.4976 1.9698 0.0721 0.5354 0.6176 0.6157 1.2760 1.7109 1.9629 2.4014 2.9319 0.2162 0.2679 1.3769 1.7134 2.1104 2.6804 3.0724 3.2769 4.0396 1.4989 1.6092 2.2079 2.4976 2.7068 3.8842 3.8599 4.3714 4.6691 1.7589 2.4418 2.3176 3.3207 3.0543 4.3723 4.3590 4.6367 4.8807 0.1454 2.1400 2.5672 3.5504 3.3989 4.4617 4.5724 5.0063 4.9371
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george korris
george korris 2022-9-12
Hi @Simon Chan when i run your code in my pc i get the following error:
Unrecognized function or variable 'readlines'.
Thank you for your time!

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Mathieu NOE
Mathieu NOE 2022-9-12
hello
maybe not the best code but seems to do the job !
filename = 'ca.txt';
a = readlines(filename);
[m,~] = size(a);
count = 0;
for ci = 1:m
current_line = char(a(ci,:));
out_comas= strfind(current_line,',');
if numel(out_comas) < numel(current_line) % keep this line
count = count+1;
% remove extra comma separators
out_comas= strfind(current_line,',');
d = [0 diff(out_comas)];
ind = find(d == 1);
line_out = current_line;
line_out(out_comas(ind)) = [];% remove extra comma separators
C{count,1} = line_out;
end
end
% export to txt file
writecell(C,'ca_out.txt',"QuoteStrings",false)
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Mathieu NOE
Mathieu NOE 2022-9-12
@george korris
here a workaround :
function lines = my_readlines(filename)
% work around for earlier matlab releases (not having readlines)
lines = regexp(fileread(filename), '\r?\n', 'split');
if isempty(lines{end}); lines(end) = []; end %end of file correction
end

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