title: Correlation Corrplot Configuration
body: <p>I am newbie in R scripts :-)</p>
  
  <p>I need build a correlation matrix and I´am trying to configurate some parameters to adapt the graph. I am using the <code>corrplot</code> package.</p>
  
  <p>I Built a corrplot matrix this way:</p>
  
  <pre><code>corrplot(cor(d1[,2:14], d1[,2:14]), method=c("color"),
           bg = "white", addgrid.col = "gray50", 
           tl.cex=1, type="lower", tl.col = "black", 
           col = colorRampPalette(c("red","white","blue"))(100))
  </code></pre>
  
  <p>I need show the values of correlation in the lower matrix inside the color matrix that I built. How i can do that?</p>
  
  <p>Is it possible exclude the main diagonal from the lower matrix? In this diagonl always we have the perfect correlation.</p>
  
  <p>The other doubt - I want to show the significant values for the correlation using stars instead of squares. like (*, , *). Is it possible?</p>
  
  <p>Can you help me guys?</p>