title: how to merge netCDF file into one?
body: <p>I did like this, with merge twice,</p>
  <h1>library(ncdf)</h1>
  <pre><code>setwd(&quot;F:/R Practie/NCDF/precipitation&quot;)
  
  p6 = open.ncdf(&quot;wrf_prec_8p5.2006.nc&quot;)
  
  p7 = open.ncdf(&quot;wrf_prec_8p5.2007.nc&quot;)
  
  p8 = open.ncdf(&quot;wrf_prec_8p5.2008.nc&quot;)
  
  p9 = open.ncdf(&quot;wrf_prec_8p5.2009.nc&quot;)
  </code></pre>
  <p>I want to this file p6,p7,p8,p9 into one p</p>
  <pre><code>p= merge(p6,p7,p8,all=TRUE)
  
  p=merge(p,p9,all=TRUE)
  </code></pre>