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  • library/doc/html/itfile.html

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    35<title>mixpp: Writing and reading data from files</title> 
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    62 <h1><a class="anchor" name="itfile">Writing and reading data from files </a></h1>Here we will use the <code>it_file</code> class to store some data. The program <code>write_it_file.cpp</code> looks as follows:<p> 
     65 
     66 
     67<h1><a class="anchor" id="itfile">Writing and reading data from files </a></h1><p>Here we will use the <code>it_file</code> class to store some data. The program <code>write_it_file.cpp</code> looks as follows:</p> 
    6368<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;itpp/itcomm.h&gt;</span> 
    6469 
    … …  
    6974        it_file ff; 
    7075 
    71         <span class="comment">// Open a file with the name "it_file_test.it"</span> 
    72         ff.open ( <span class="stringliteral">"it_file_test.it"</span> ); 
     76        <span class="comment">// Open a file with the name &quot;it_file_test.it&quot;</span> 
     77        ff.open ( <span class="stringliteral">&quot;it_file_test.it&quot;</span> ); 
    7378 
    7479        <span class="comment">// Create some data to put into the file</span> 
    7580        vec a = linspace ( 1, 20, 20 ); 
    7681 
    77         <span class="comment">// Put the variable a into the file. The Name("a") tells the file class</span> 
    78         <span class="comment">// that the next variable shall be named "a".</span> 
    79         ff &lt;&lt; Name ( <span class="stringliteral">"a"</span> ) &lt;&lt; a; 
     82        <span class="comment">// Put the variable a into the file. The Name(&quot;a&quot;) tells the file class</span> 
     83        <span class="comment">// that the next variable shall be named &quot;a&quot;.</span> 
     84        ff &lt;&lt; Name ( <span class="stringliteral">&quot;a&quot;</span> ) &lt;&lt; a; 
    8085 
    8186        <span class="comment">// Force the file to be written to disc. This is useful when performing</span> 
    … …  
    9095        <span class="keywordflow">return</span> 0; 
    9196} 
    92 </pre></div><p> 
    93 When you run this program you will obtain a file called <code>it_file_test.it</code> in your current directory. You can read the file into Matlab/Octave to view the data by using the following commands:<p> 
    94 <div class="fragment"><pre class="fragment">itload(<span class="stringliteral">'it_file_test.it'</span>) 
     97</pre></div><p>When you run this program you will obtain a file called <code>it_file_test.it</code> in your current directory. You can read the file into Matlab/Octave to view the data by using the following commands:</p> 
     98<div class="fragment"><pre class="fragment">itload(<span class="stringliteral">&apos;it_file_test.it&apos;</span>) 
    9599figure(1); clf; 
    96100plot(a) 
    97 </pre></div><p> 
    98 Note: Make sure that <code>$PREFIX/share/itpp</code> is in your Matlab/Octave path and that you run the code above from the directory where <code>it_file_test.it</code> is located (<code>$PREFIX</code> is the IT++ installation prefix; <code>/usr/local</code> by default).<p> 
    99 The IT++ program <code>read_it_file.cpp</code> that reads the file and prints its content can look like this:<p> 
    100 <div class="fragment"><pre class="fragment"></pre></div><p> 
    101 Here is the output of the program:<p> 
     101</pre></div><p>Note: Make sure that <code>$PREFIX/share/itpp</code> is in your Matlab/Octave path and that you run the code above from the directory where <code>it_file_test.it</code> is located (<code>$PREFIX</code> is the IT++ installation prefix; <code>/usr/local</code> by default).</p> 
     102<p>The IT++ program <code>read_it_file.cpp</code> that reads the file and prints its content can look like this:</p> 
     103<div class="fragment"><pre class="fragment"></pre></div><p>Here is the output of the program:</p> 
    102104<div class="fragment"><pre class="fragment"> 
    103105a = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20] 
    104106</pre></div> </div> 
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