How do I get a mixed string from several arrays of strings?

I have several arrays of strings which is used to store collections of factors. for example:

factor1={'male';'female'}; factor2={'easy'; 'normal';'hard'};

I want to create a set of filenames for following works.

This is what I want to get:

filename =

    'male_easy.txt'
    'male_normal.txt'
    'male_hard.txt'
    'female_easy.txt'
    'female_normal.txt'
    'female_hard.txt'

This is what I tried:

filename={};

for i=1:length(factor1)

    for j=1:length(factor2)

filename=[filename,[factor1(i),'_',factor2(j),'.txt']];

    end

end

I noticed that [factor1(i),'_',factor2(j),'.txt'] will became↓(when i=1,j=1)

filename =

    'male'    '_'    'easy'    '.txt'

I failed in getting the strings together.

How can I fix it?

Answer 1

[Orion]

Hi,

that's because you used "()" instead of "{}" to access element of a cell, and a "," instead of ";" to concatenate vertically.

you juste need to do :

factor1={'male';'female'};
factor2={'easy'; 'normal';'hard'};

filename={};
for i=1:length(factor1)    
    for j=1:length(factor2)
        filename=[filename;[factor1{i},'_',factor2{j},'.txt']];        
    end
end

[Pelle]

Thank you very much for your quick and helpful answer!!

Answer 2

[Mischa Kim]

Pelle, use instead

 for ii = 1:numel(factor1)
    for jj = 1:numel(factor2)
       filename{jj+(ii-1)*numel(factor2)} = strcat(factor1(ii),'_',factor2(jj),'.txt');  
    end
 end

Note that i and j are also used as the imaginary unit.