MATLAB Answers

Fat Man

How to remove \n and empty line after combine all the lines into an array

Asked by Fat Man
on 15 Jun 2019
Latest activity Edited by per isakson
on 15 Jun 2019
I have a txt file 'map1.txt'
1 Ai.A
2 i.i.
3 .Aii
4 AiiA
I want to concatenate all the lines of the file into an array.
However, my arr includes and ' '
' '
Can anyone show me how to remove and ' '
This is my code. Thank you for your help!!!
fh = fopen('map1.txt')
line = fgets(fh)
vec = [line]
while ischar(line)
line = fgets(fh);
vec(end+1,:) = line;


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1 Answer

Answer by per isakson
on 15 Jun 2019
Edited by per isakson
on 15 Jun 2019
 Accepted Answer

fgetl, Read line from file, removing newline characters
In response to comment
To remove the ending "blank" row, replace
while ischar(line)
while not(feof(fh))
while not(feof(fh)) avoids reading one or more trailing empty lines, i.e. lines containing only newline characters.
To remove trailing rows that contains pure white-space add these lines to the end of the script
while isempty(strtrim(vec(end,:)))


"I still get ' ' at the end. How can I delete it??"
strtrim or deblank
Surprice! The last row are not spaces, it's nulls
>> double(vec)
ans =
65 105 46 65
105 46 105 46
46 65 105 105
65 105 105 65
0 0 0 0
The last row is caused by one trailing empty line in combination with while ischar(line)
See the addendum to my answer.

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