title: What does the symbol ::: mean in R
body: <p>I came across this in the following context from B. Pfaff's "Analysis of Integrated and Cointegrated Time Series in R"</p>
  
  <pre><code>## Impulse response analysis of SVAR A−type model 1
  args (vars ::: irf.svarest) 2
  irf.svara &lt;− irf (svar.A, impulse = ”y1 ” , 3
  response = ”y2 ” , boot = FALSE) 4
  args (vars ::: plot.varirf) 5
  plot (irf.svara)
  </code></pre>