help for fprintf command !!!!!!!

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yasemin sirin
yasemin sirin 2017-3-22
回答： yasemin sirin 2017-3-22
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..

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回答（3 个）

Jan
Jan 2017-3-22
编辑：Jan 2017-3-22
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);
ES
ES 2017-3-22
编辑：ES 2017-3-22
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);
yasemin sirin
yasemin sirin 2017-3-22
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

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