MATLAB: Input/Output Function’s, need content and display help

for loopfunctionsinputMATLABoutput

Im creating a function to output future value of invested money by F=P*(1+(i/1200))^n, where i us interest rate, P is initial invested money, and n is the number of months. I need to input P,i,and n, which i have done. I need to get both the months and future values to display in side by side columns like this:
Month Future Value
===== ============
   1    $502.08
   2    $504.18
and so on..
Here's what I've been able to come up with:
fid=fopen('interest.txt','w');
P=input('Enter initial investment: ');
i=input('Enter investment interest rate(in %): ');
x=input('Enter investment period(in months): ');
fprintf('Output file sucessfully created.')
for n=1:x
F=P*(1+(i/1200))^n
end
fclose(fid)
fid=fopen('interest.txt','r');
[n F]=fscanf(fid,'%d');
fclose(fid);
disp(n)
disp(F)
I don't know why the months and Future values aren't displaying, but the Future value from the for loop does. but more importantly, how should i be displaying this. I'm assuming fprintf but i cant get the F and N to display.

Best Answer

Here is how I would do it, if I was going to write to the file then display the file contents in two steps...
fid = fopen('interest.txt','wt');
P = input('Enter initial investment: ');
I = input('Enter investment interest rate(in %): ');
x = input('Enter investment period(in months): ');
for n=1:x
    F=P*(1+(I/1200))^n;
    fprintf(fid, '%d\t$%.2f\n', n, F);
end
tf2 = fclose(fid);
if fid~=-1 && ~tf2
    fprintf('\t\t\nOutput file successfully created.\n\n');
else
    fprintf('\t\t\nProblem encountered opening or closing file.\n\n');
end
fid = fopen('interest.txt','r');
T = textscan(fid,'%d\t$%.2f');
n = T{1};
F = T{2};
fprintf('Month\tFuture Value\n\n')
for ii = 1:length(n)
    fprintf('%d\t\t$%.2f\n',n(ii),F(ii))
end
fclose(fid);
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