-- FreeFem++ v4.6 (Thu Apr  2 15:47:38 CEST 2020 - git v4.6)
 Load: lg_fem lg_mesh lg_mesh3 eigenvalue 
    1 : //  Location:
    2 : //
    3 : //    http://people.sc.fsu.edu/~jburkardt/freefem_src/io_test/io_test.edp
    4 : //
    5 : //  Discussion:
    6 : //
    7 : //    This example illustrates how FreeFem++ can read and write text files.
    8 : //
    9 : //    Note that a file containing a vector must have an initial record
   10 : //    listing the number of elements in the file.  Thus, the file "input.txt"
   11 : //    has the form:
   12 : //
   13 : //    11
   14 : //    0  1  2  3  4
   15 : //    5  6  7  8  9
   16 : //    10
   17 : //
   18 : //  Licensing:
   19 : //
   20 : //    This code is distributed under the GNU LGPL license.
   21 : //
   22 : //  Modified:
   23 : //
   24 : //    04 February 2015
   25 : //
   26 : //  Reference:
   27 : //
   28 : //    John Chrispell, Jason Howell,
   29 : //    Finite Element Approximation of Partial Differential Equations
   30 : //    Using FreeFem++, or, How I Learned to Stop Worrying and Love
   31 : //    Numerical Analysis.
   32 : //
   33 : //    Frederic Hecht,
   34 : //    New development in FreeFem++,
   35 : //    Journal of Numerical Mathematics,
   36 : //    Volume 20, Number 3-4, 2012, pages 251-265.
   37 : //
   38 :   cout << "\n";
   39 :   cout << "io_test:\n";
   40 :   cout << "  FreeFem++ version\n";
   41 :   cout << "  Read values from the file 'input.txt'\n";
   42 :   cout << "  Write their square roots to the file 'output.tx
  ... : t'\n";
   43 : //
   44 : //  Declare IN to be an input unit.
   45 : //
   46 : ifstream in ( "input.txt" );
   47 : //
   48 : //  Declare U to be a real array indexed by integers.
   49 : //
   50 : real[int] u(11);
   51 : //
   52 : //  Read data from "input.txt" into U.
   53 : //
   54 : in >> u;
   55 : //
   56 : //  Declare V to be a real array indexed by integers.
   57 : //
   58 : real[int] v(11);
   59 : //
   60 : //  Manipulate the data and print it to convince us it got here.
   61 : //
   62 : for ( int j = 0; j < 11; j++ )
   63 : {
   64 :   v[j] = sqrt ( u[j] );
   65 :   cout << "  " << u[j] 
   66 :        << "  " << v[j] << "\n";
   67 : }
   68 : //
   69 : //  Declare OUT to be an output unit.
   70 : //
   71 : ofstream out ( "output.txt" );
   72 : //
   73 : //  Write V to the output unit.
   74 : //
   75 : out << v;
   76 : //
   77 : //  Terminate.
   78 : //
   79 : cout << "\n";
   80 : cout << "io_test\n";
   81 : cout << "  Normal end of execution.\n";
   82 : 
   83 :  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.
times: compile 0.004061s, execution 0.000208s,  mpirank:0
 CodeAlloc : nb ptr  3489,  size :468512 mpirank: 0
Ok: Normal End