title: why i getting this error Cannot plot 1/exp(2*w*i): This function has no real values
body: <pre><code>
   syms w t
   X = exp(j.*-2.*w);
   subplot(2,1,1)
   ezplot(X, [-10 10]);
   Xf = fourier(X,t);
   subplot(2,1,2)
   ezplot(Xf, [-10 10]);
  
  </code></pre>
  <p><strong>error</strong></p>
  <p>Error in ==&gt; ezplot&gt;ezplot1 at 422
  error(nargchk(4, 6, nargin, 'struct'));</p>
  <p>??? Output argument &quot;hp&quot; (and maybe others) not assigned during call to &quot;D:\Matlab\toolbox\matlab\specgraph\ezplot.m&gt;ezplot1&quot;.</p>
  <p>Error in ==&gt; ezplot at 146
  [hp, cax] = ezplot1(cax, f{1}, vars, labels, args{:});</p>
  <p>Error in ==&gt; sym.ezplot at 58
  h = ezplot(char(f),varargin{:});</p>
  <p>Error in ==&gt; lab09 at 5
  ezplot(X, [-10 10]);</p>