Print concatenated string to screen and text file using matlab

Question

This is a very basic question, but since I'm new to Matlab, I'm struggling to find a good way to do so. I just want to print some concatenated strings to screen and to a text file. Matlab is "eating" the \n !!

str1 = sprintf('Line 1\n');
str2 = sprintf('Line 2\n');
finalStr = strcat(str1,str2);
% Print on screen
fprintf('%s',finalStr );
% Result: Line 1Line 2. What happened to the \n ?? !!!!

% Print on file
[curPath,name,ext] = fileparts(mfilename('fullpath'));
infoPath = fullfile(curPath,'MyFile.txt');
fid = fopen(infoPath,'w'); % Write only, overwrite if exists
fprintf(fid,finalStr);
fclose(fid);

I also need to save finalStr to a text file. What I'm missing here?

also double-check this mathworks.com/matlabcentral/answers/… — 16per9
– 16per9, Commented May 6, 2016 at 14:02
From the documentation for strcat: For character array inputs, strcat removes trailing ASCII white-space characters: space, tab, vertical tab, newline, carriage return, and form feed. You have a trailing newline. Use horzcat instead. — sco1
– sco1, Commented May 6, 2016 at 14:03

ibezito · Accepted Answer · 2016-05-06 16:17:21Z

2

The function strcat ignores white spaces. In order to perform this operation, use:

finalStr = [str1, str2];
fprintf('%s',finalStr );

result:

Line 1 
Line 2

Edit: To write the text on a text file in a "Notepad" way:

% Notepad needs \r also.
newline = sprintf('\n');
newlineNotepad = sprintf('\r\n');
strB = strrep(strA, newline, newlineNotepad);

edited May 6, 2016 at 16:17

answered May 6, 2016 at 14:04

ibezito

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9 Comments

Pedro77 Over a year ago

It prints correctly on screen now, but not on the text file.

ibezito Over a year ago

the reason is that I used the name finalstr and not finalStr. I updated my answer accordingly, it should work now.

Pedro77 Over a year ago

I'm sing the correct names. In the text file the resulting text does not consider the \n.

sco1 Over a year ago

@Pedro77 your fprintf call is not correct. Also, don't use notepad to view your file.

ibezito Over a year ago

@Padro77, as excaze mentioned, use some other program such as Interner browser, notepad++ or wordPad to view that it does work for files as well

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matlabgui · Accepted Answer · 2016-05-06 14:13:09Z

0

You could also remove the use of strcat completely:

fprintf('%s%s',str1, str2);

answered May 6, 2016 at 14:13

matlabgui

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