| 1 | | Here we will use the {\tt it\_\-file} class to store some data. The program {\tt write\_\-it\_\-file.cpp} looks as follows: |
| 2 | | |
| 3 | | |
| 4 | | |
| 5 | | \begin{DocInclude}\begin{verbatim}#include <itpp/itcomm.h> |
| 6 | | |
| 7 | | using namespace itpp; |
| 8 | | |
| 9 | | int main() |
| 10 | | { |
| 11 | | // Declare the it_file class |
| 12 | | it_file ff; |
| 13 | | |
| 14 | | // Open a file with the name "it_file_test.it" |
| 15 | | ff.open("it_file_test.it"); |
| 16 | | |
| 17 | | // Create some data to put into the file |
| 18 | | vec a = linspace(1, 20, 20); |
| 19 | | |
| 20 | | // Put the variable a into the file. The Name("a") tells the file class |
| 21 | | // that the next variable shall be named "a". |
| 22 | | ff << Name("a") << a; |
| 23 | | |
| 24 | | // Force the file to be written to disc. This is useful when performing |
| 25 | | // iterations and ensures that the information is not stored in any cache |
| 26 | | // memory. In this simple example it is not necessary to flush the file. |
| 27 | | ff.flush(); |
| 28 | | |
| 29 | | // Close the file |
| 30 | | ff.close(); |
| 31 | | |
| 32 | | // Exit program |
| 33 | | return 0; |
| 34 | | } |
| 35 | | \end{verbatim} |
| 36 | | \end{DocInclude} |
| 37 | | |
| 38 | | |
| 39 | | When you run this program you will obtain a file called {\tt it\_\-file\_\-test.it} in your current directory. You can read the file into Matlab/Octave to view the data by using the following commands: |
| 40 | | |
| 41 | | |
| 42 | | |
| 43 | | \begin{Code}\begin{verbatim}itload('it_file_test.it') |
| 44 | | figure(1); clf; |
| 45 | | plot(a) |
| 46 | | \end{verbatim} |
| 47 | | \end{Code} |
| 48 | | |
| 49 | | |
| 50 | | |
| 51 | | Note: Make sure that {\tt \$PREFIX/share/itpp} is in your Matlab/Octave path and that you run the code above from the directory where {\tt it\_\-file\_\-test.it} is located ({\tt \$PREFIX} is the IT++ installation prefix; {\tt /usr/local} by default). |
| 52 | | |
| 53 | | The IT++ program {\tt read\_\-it\_\-file.cpp} that reads the file and prints its content can look like this: |
| 54 | | |
| 55 | | |
| 56 | | |
| 57 | | \begin{DocInclude}\begin{verbatim}\end{verbatim} |
| 58 | | \end{DocInclude} |
| 59 | | |
| 60 | | |
| 61 | | Here is the output of the program: |
| 62 | | |
| 63 | | |
| 64 | | |
| 65 | | \footnotesize\begin{verbatim} |
| 66 | | a = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] |
| 67 | | \end{verbatim} |
| 68 | | \normalsize |
| 69 | | |
