title: Correlation plots for non square correlation matrix with significance stars
body: <p>I computed several non square correlation matrixes now I want to plot them. I found several packages to do so like <code>corrplot</code> and <code>corrgram</code>, but I can only get them to work with square matrixes. What are the correct parameters for non square matrixes?</p>
  
  <p>My tries so far:</p>
  
  <pre><code>library(psych)
  x &lt;- psych::corr.test(P19[2:ncol(P19)], motivation_on[2:ncol(motivation_on)], method = "spearman")
  
  
  xoxo &lt;- as.data.frame(x[1])
  library(corrplot)
  corrplot(xoxo, method = "number")
  </code></pre>
  
  <p>The goal is to have a plot like in this post including significance stars:
  <a href="https://www.r-bloggers.com/correlograms-are-correlicious/" rel="nofollow noreferrer">https://www.r-bloggers.com/correlograms-are-correlicious/</a></p>
  
  <p>PS: My correlation matrix looks like this, note that I do not correlate the vars within the dataframes to avoid a giant matrix:
  <a href="https://i.stack.imgur.com/4j6qZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4j6qZ.png" alt="enter image description here"></a></p>