help for fprintf command !!!!!!!

ı want to see random number generated in 1 run

for i = 1 : n

a=rand(1);

city_1 = round(length(inputcities)*a); 

fileID = fopen('rndm.txt','w+');

for i=1:length(a)

fprintf(fileID,'%6.4f\n',a);

end

fclose(fileID);

when ı run programe it writes only one value for a.. but ı want it to write all rondom numbers during one run

thanks..

Answer 1

[Jan]

fileID = fopen('rndm.txt','w+');
for i = 1 : n
  a = rand(1);
  city_1 = round(length(inputcities)*a);  % Not used at all
  fprintf(fileID, '%6.4f\n', a);
end
fclose(fileID);

Open the file once before the loop. You do not need the for i=1:length(a) loop, when a has one element only.

This might be easier:

fileID = fopen('rndm.txt', 'w+');
a = rand(1, n);
fprintf(fileID, '%6.4f\n', a);
fclose(fileID);

Answer 2

[ES]

You are opening the file in write mode inside a for loop. So everytime the file gets overwritten.

Open the file (fileID = fopen('rndm.txt','w+');) before the for loop.

fileID = fopen('rndm.txt','w+');
for i = 1 : n
    a=rand(1);
    city_1 = round(length(inputcities)*a);
    for i=1:length(a)

          fprintf(fileID,'%6.4f\n',a);

      end
  end
  fclose(fileID);

Answer 3

[yasemin sirin]

thanks for your answers....ı open the file outside the loop and ı changed w+ to a+ then i can get whole set of random numbers.... again thanks so much