why is there no lines in in my plot

clear;

clc;

close all;

%input the filename you want to consider

%filename=input('what is the filename you want to consider \n','s');

folder ="C:\Users\Ajuff\CLionProjects\C++ML\C++MLP1\cmake-build-debug\tempvstime.txt";

%load file into variable data

data = load(folder);

for n=1:length(data)

fprintf('%f %f\n',data(n,1),data(n,2));

x=data(n,1);

y=data(n,2);

plot(x,y,'g')

end

why is there nothing in the plot the fprint f prints out values