title: cannot change pch (point symbol) in R chart.Correlation
body: <p>I used the 'chart.Correlation' in 'performanceAnalytics' package to draw a correlation matrix plot. But I cannot change the point symbol with 'pch' parameter. Here is the code,</p>
  
  <pre><code>install.packages("PerformanceAnalytics")
  library(PerformanceAnalytics)   
  chart.Correlation(iris[1:4], histogram=TRUE, pch=3)
  </code></pre>
  
  <p>and what I got, <a href="https://i.stack.imgur.com/87Mwb.jpg" rel="nofollow noreferrer">the correlation matrix plot</a>. In fact, none of the passthru parameters work (e.g. labels, lty).</p>