Import text file with blank lines. Matlab not replacing them with NaN

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mashtine
mashtine 2015-1-29
编辑： per isakson 2015-1-30
Matlab is not replacing my blank lines in my txt file with NaN but just joins all the data together. Unfortunately I need to data in the exact order it is as each line is a unique timestamp but the times are do not come in the txt file.
Any ideas? Tried importdata and textscan with no luck. Using R2014b

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per isakson
per isakson 2015-1-29
编辑：per isakson 2015-1-30
Remains (at least) two possibilities
  • a loop over fgetl
  • read the file as one string, replace empty lines by 'nan nan ... ' and parse with textscan
Example (R2013a)
>> cac = cssm;
>> cac{:}
ans =
16 2 3 13
5 11 10 8
NaN NaN NaN NaN
9 7 6 12
4 14 15 1
where
function cac = cssm
str = fileread('cssm.txt');
str = regexprep( str, '(?<=\r?\n)[ ]*(?=\r?\n)', 'nan nan nan nan');
cac = textscan( str, '%f%f%f%f', 'CollectOutput', true );
end
and where cssm.txt contains
16 2 3 13
5 11 10 8
9 7 6 12
4 14 15 1
&nbsp
Replace
str = regexprep( str, '(?<=\r?\n)[ ]*(?=\r?\n)', 'nan nan nan nan');
by
str = regexprep( str, '(?<=\r?\n)[ ]*(?=\r?\n)' ...
, 'nan nan nan nan', 'emptymatch' );
to handle empty lines
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per isakson
per isakson 2015-1-30
Hi Cedric,
You are right, "\r" is not needed in the "look behind". And possibly, it saves on execution time to exclude it.

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