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,

```
install.packages("PerformanceAnalytics")
library(PerformanceAnalytics)   
chart.Correlation(iris[1:4], histogram=TRUE, pch=3)

```

and what I got, [the correlation matrix plot](https://i.stack.imgur.com/87Mwb.jpg). In fact, none of the passthru parameters work (e.g. labels, lty).