Problem about Output in a txt file?How to solve it

x = 0:.1:1;
A = [x; exp(x)];
fileID = fopen('exp.txt','w');
fprintf(fileID,'%6s %12s\n','x','exp(x)');
fprintf(fileID,'%6.2f %12.8f\n',A);
fclose(fileID);

     x       exp(x)
  0.00   1.00000000
  0.10   1.10517092
  0.20   1.22140276
  0.30   1.34985881
  0.40   1.49182470
  0.50   1.64872127
  0.60   1.82211880
  0.70   2.01375271
  0.80   2.22554093
  0.90   2.45960311
  1.00   2.71828183

Can I add data and output it row by row? like

x    exp(x)
0    1

then I could add one more row without to define the x again?

x   exp(x)
0   1 
0.4 1.49

it is because the result inside a for loop each time only output one row.

But,I don't want store all the result into matrix ,then like what I do above.

I want each time after 1 loop it can add one row.

like writing stuff in csv file result(1,i) result(1,i+1)

Answer 1

[Rick Rosson]

Open the file with permission set to append:

   fileID = fopen('exp.txt','a');