to use for optional display

 OUTPUTS
  feven   - even symmetric filter (-cosine masked with Gaussian)
  fodd    - odd symmetric filter (-sine masked with Gaussian)

 EXAMPLE
  sig = 15; f=filterGabor1d(2*sig,sig,1/sig,1);

 See also <a href="filterGabor2d.html" class="code" title="function [Feven,Fodd] = filterGabor2d( r, sig, lam, theta, omega, show )">FILTERGABOR2D</a>

 Piotr's Computer Vision Matlab Toolbox      Version 2.0
 Copyright 2014 Piotr Dollar.  [pdollar-at-gmail.com]
 Licensed under the Simpl