-- FreeFem++ v4.14 (mer. 06 mars 2024 16:59:04 CET - git v4.14-1-g2b2052ae)
   file : io_test.edp
 Load: lg_fem lg_mesh lg_mesh3 eigenvalue 
    1 : //  io_test.edp
    2 : //
    3 : //  Discussion:
    4 : //
    5 : //    This example illustrates how FreeFem++ can read and write text files.
    6 : //
    7 : //    Note that a file containing a vector must have an initial record
    8 : //    listing the number of elements in the file.  Thus, the file "input.txt"
    9 : //    has the form:
   10 : //
   11 : //    11
   12 : //    0  1  2  3  4
   13 : //    5  6  7  8  9
   14 : //    10
   15 : //
   16 : //  Licensing:
   17 : //
   18 : //    This code is distributed under the MIT license.
   19 : //
   20 : //  Modified:
   21 : //
   22 : //    04 February 2015
   23 : //
   24 : //  Reference:
   25 : //
   26 : //    John Chrispell, Jason Howell,
   27 : //    Finite Element Approximation of Partial Differential Equations
   28 : //    Using FreeFem++, or, How I Learned to Stop Worrying and Love
   29 : //    Numerical Analysis.
   30 : //
   31 : //    Frederic Hecht,
   32 : //    New development in FreeFem++,
   33 : //    Journal of Numerical Mathematics,
   34 : //    Volume 20, Number 3-4, 2012, pages 251-265.
   35 : //
   36 :   cout << "\n";
   37 :   cout << "io_test():\n";
   38 :   cout << "  FreeFem++ version\n";
   39 :   cout << "  Read values from the file 'input.txt'\n";
   40 :   cout << "  Write their square roots to the file 'output.tx
  ... : t'\n";
   41 : //
   42 : //  Declare IN to be an input unit.
   43 : //
   44 : ifstream in ( "input.txt" );
   45 : //
   46 : //  Declare U to be a real array indexed by integers.
   47 : //
   48 : real[int] u(11);
   49 : //
   50 : //  Read data from "input.txt" into U.
   51 : //
   52 : in >> u;
   53 : //
   54 : //  Declare V to be a real array indexed by integers.
   55 : //
   56 : real[int] v(11);
   57 : //
   58 : //  Manipulate the data and print it to convince us it got here.
   59 : //
   60 : for ( int j = 0; j < 11; j++ )
   61 : {
   62 :   v[j] = sqrt ( u[j] );
   63 :   cout << "  " << u[j] 
   64 :        << "  " << v[j] << "\n";
   65 : }
   66 : //
   67 : //  Declare OUT to be an output unit.
   68 : //
   69 : ofstream out ( "output.txt" );
   70 : //
   71 : //  Write V to the output unit.
   72 : //
   73 : out << v;
   74 : //
   75 : //  Terminate.
   76 : //
   77 : cout << "\n";
   78 : cout << "io_test():\n";
   79 : cout << "  Normal end of execution.\n";
   80 : 
   81 : exit ( 0 );
   82 :  sizestack + 1024 =1696  ( 672 )


io_test():
  FreeFem++ version
  Read values from the file 'input.txt'
  Write their square roots to the file 'output.txt'
  0  0
  1  1
  2  1.41421
  3  1.73205
  4  2
  5  2.23607
  6  2.44949
  7  2.64575
  8  2.82843
  9  3
  10  3.16228

io_test():
  Normal end of execution.
  current line = 81
exit(0)
 err code 0 ,  mpirank 0
 CodeAlloc : nb ptr  3861,  size :516432 mpirank: 0
Ok: Normal End