title: How do I change the per-period bars from charts.PerformanceSummary() to calendar year?
body: <p>I am trying to save a simple performance summary graph and was hoping there would be a way to change the periodicity of the bar charts from monthly returns to annual/ calendar year returns. </p>
  
  <p>I've looked through the documentation for the package (<a href="https://cran.r-project.org/web/packages/PerformanceAnalytics/vignettes/PA-charts.pdf" rel="nofollow noreferrer">https://cran.r-project.org/web/packages/PerformanceAnalytics/vignettes/PA-charts.pdf</a>) but they didn't have any helpful information that I could find</p>
  
  <pre><code>  pdf(paste(Current, "Growth.pdf", sep = "_"))
    print(charts.PerformanceSummary(growth_returns,
                              colorset = colorsets,
                              wealth.index = TRUE,
                              main = paste(target_Ticker, "Investment Growth", sep = " ")))
  </code></pre>
  
  <p>Is what I currently have, but I can't find anything in the package to change this aspect. The returns are monthly as of now.</p>