When moving data in the opposite direction with the complementary
procedures <a href="../Ref/cast.html">cast</a> or
<a href="../Ref/from_file.html">from_file</a>, the same <code>fmt</code> is required to
properly cast the data. Specifying a <code>fmt</code> that is different from what
is actually present may result in an I/O syntax error.</p>
<div class="alert alert-info">
<p class="alert-title h4">Note</p>
<p>By default, <code>real</code> and <code>complex</code> data will be written with a
number of signi