How to use textscan with empty char fields
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Joan Vazquez
le 18 Nov 2021
Commenté : Joan Vazquez
le 22 Nov 2021
How can I use textscan with files that include these kind of lines, with empty chars?
m1 = 'HELLO,42.53,A,B,1,C'; % Only this works fine
m2 = 'HELLO,42.53,A,,1,C';
m3 = 'HELLO,42.53,A,B,1,';
m4 = 'HELLO,42.53,,,1,C';
pattern = 'HELLO%f%c%c%f%c';
delimiter = ',';
[C1, pos1] = textscan(m1, pattern, 'Delimiter', delimiter)
[C2, pos2] = textscan(m2, pattern, 'Delimiter', delimiter)
[C3, pos3] = textscan(m3, pattern, 'Delimiter', delimiter)
[C4, pos4] = textscan(m4, pattern, 'Delimiter', delimiter)
1 commentaire
Adam Danz
le 18 Nov 2021
Since this doesn't answer the question, How can I use textscan ..., I'll leave a comment rather than an answer.
A workaround is to use strsplit and then some post-processing to convert chars to numbers.
m1 = 'HELLO,42.53,A,B,1,C';
m2 = 'HELLO,42.53,A,,1,C';
m3 = 'HELLO,42.53,A,B,1,';
m4 = 'HELLO,42.53,,,1,C';
cleanStrFcn = @(s)[str2double(s{2}),s(3:end)];
s1 = cleanStrFcn(strsplit(m1,',','CollapseDelimiters',false))
s2 = cleanStrFcn(strsplit(m2,',','CollapseDelimiters',false))
s3 = cleanStrFcn(strsplit(m3,',','CollapseDelimiters',false))
s4 = cleanStrFcn(strsplit(m4,',','CollapseDelimiters',false))
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Jeremy Hughes
le 18 Nov 2021
The format specifier %c always reads one character, no matter what that character is. What you likely want it %s, which reads all the characters up to the next matching delimiter.
2 commentaires
Stephen23
le 18 Nov 2021
str = sprintf('%s\n', 'HELLO,42.53,A,B,1,C', 'HELLO,42.53,A,,1,C', 'HELLO,42.53,A,B,1,', 'HELLO,42.53,,,1,C')
out = textscan(str, 'HELLO,%f%s%s%f%s', 'Delimiter',',');
out{:}
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