Problem with newline in a "flexible" formatspec

Hi!

I'm trying to write data to a csv-file based on some image processing done by my matlab-script. The data is stored in a cell where the number of rows equals the number of images with each column consisting of some numerical value describing some feauture in the images. I use the fprintf function for this, and it worked great when I had a fixed amount of columns... Let's say I had 3 features, i.e. three columns with numbers. Then I would just write something like:

for row=1:Nrows
    fprint(fid,'%s,%f,%f,%f\n',results{row,:})
end

(The first entry is just the file name of each image.) Now however I want to describe a variable number of features, let's say N features. Then I modify the formatspec string to:

formatspec = ['%s' repmat(',%f',1,N) '\n']

This puts in all the entries alright, but completely ignores newline characters... Do you have any idea why, and maybe how to fix it -- preferrably by just correcting the formatspec string somehow? I am using Matlab2016a by the way.

Thanks in advance!

P.S.: Here is a minimal example that you can play around with.

results = {'1.tif',1,2; '2.tif',3,4};
fid = fopen('myfile.csv','w');
for row=1:length(results(:,1))
    fprintf(fid, ['%s' repmat(',%f',1,length(results(1,:))) '\n'], results{row,:});
end
fclose(fid);

Answer 1

[Asad (Mehrzad) Khoddam]

The right code is

results = {'1.tif',1,2; '2.tif',3,4};
fid = fopen('myfile2.csv','w');
repmat(',%f',1,length(results(1,:)))
for row=1:length(results(:,1))
    fprintf(fid, ['%s' [repmat(',%f',1,length(results(1,:))-1) '\n']], results{row,:});
end
fclose(fid);

[Søren Hanghøj Møller]

Thanks! :-)

Just out of curiosity: Do you know why your solution works, i.e. what does the extra brackets do?

Edit: I see know that I put one '%f' too many... very embarrassing! Thanks again Asad for helping me with this problem.

[Asad (Mehrzad) Khoddam]

you can uses [ and ] for making bigger vectors or even bigger strings.It is used here for joining string together.