title: Set the background color as the intensity of data in corrplot
body: <p>I have a matrix of data and I want to use the background color to show the value of the element of the matrix so the darker the background the bigger the matrix element. I have used corrplot like this:</p>
  
  <pre><code>corrplot(overlaps[[1]], method="number", is.corr=FALSE, type="full",
           cl.lim=c(0,100), addgrid.col="red", addshade="positive")
  </code></pre>
  
  <p>and the matrix would be like below:
  <img src="https://i.stack.imgur.com/YDob7.png" alt="enter image description here"></p>
  
  <p>But I want the background to show the intensity not the numbers as here. What should I do?</p>
  
  <p>Thank you in advance</p>