string output in text-file without " " (quotation notes). MATLAB BUG? comma in string effects quotation notes in .txt-file
显示 更早的评论
Hi guys!
I noticed something strange in MATLAB. Maybe anybody knows this problem.
I would like to write a string-vector into a .txt-file.
If my string-vector contains a comma "," so my .txt.file begins with an quotation mark and end with one "....."
But i need a .txt-file without quotation marks, only with the strings, which maybe contains commas...
example 1 without comma in string and so without quotation marks in .txt-file:
Name1 = "Walter";
Gewicht1 = 55;
testvektor(1,1) = "Walter hat " + " / Hunger "+"";
testvektor(2,1) = "Gewicht" + ": " + Gewicht1;
fid = fopen('Textdatei.txt','wt');
writematrix(testvektor,'Textdatei.txt',"FileType","text")
fclose(fid);
Output example 1:
Walter hat / Hunger
Gewicht: 55
example 2 with comma in string and so with quotation marks in .txt-file:
Name1 = "Walter";
Gewicht1 = 55;
testvektor(1,1) = "Walter hat " + " / Hunger "+",";
testvektor(2,1) = "Gewicht" + ": " + Gewicht1;
fid = fopen('Textdatei.txt','wt');
writematrix(testvektor,'Textdatei.txt',"FileType","text")
fclose(fid);
Output example 2:
"Walter hat / Hunger "
"Gewicht: 55"
Thank you for helping guys!
Hope you know the issue!
Best regards,
Maxim
2 个评论
Walter Roberson
2022-3-12
It is not advisable to fopen(), writematrix(), fclose(). writematrix() does not operate on a file identifier: it opens and closes the file as needed. The extra fopen() justs risks glitches, unnecessarily.
Maxim Kindsvater
2022-3-13
采纳的回答
You can use "QuoteStrings","none" in your call to writematrix() to avoid writing the double-quotes in either case:
Name1 = "Walter";
Gewicht1 = 55;
testvektor(1,1) = "Walter hat " + " / Hunger "+"";
testvektor(2,1) = "Gewicht" + ": " + Gewicht1;
testvektor
writematrix(testvektor,'Textdatei.txt',"FileType","text","QuoteStrings","none")
show_file_contents('Textdatei.txt');
testvektor(1,1) = "Walter hat " + " / Hunger "+",";
testvektor(2,1) = "Gewicht" + ": " + Gewicht1;
testvektor
writematrix(testvektor,'Textdatei.txt',"FileType","text","QuoteStrings","none")
show_file_contents('Textdatei.txt');
Or you can use fprintf() instead of writematrix():
fid = fopen('Textdatei.txt','w');
fprintf(fid,'%s\n',testvektor);
fclose(fid);
show_file_contents('Textdatei.txt');
function show_file_contents(fn)
fid = fopen(fn);
data = fread(fid,'*char').';
fclose(fid);
disp(data);
end
1 个评论
Jan
2022-3-12
Exactly. In a comma separated text file, the occurence of one comma inside the strings would create an ambiguous file. To avoid this double quotes are added as default when commas are found.
This is a smart feature, which can be confusing. This is a typical effect of applying heuristics to guess, what the users wants.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Characters and Strings 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
