[R-SIG-Finance] plotting market cap heatmap

[Khanh Nguyen]

Hi,

Let say I have this data frame.

> tickers <- toupper(letters[1:5])
> market.cap <- c(100, 60, 700, 1500, 450)
> change <- c(0.02, 0.004, 0.0012, 0.001, 0.030
> data <- data.frame(tickers, market.cap, change)
> data
  tickers market.cap change
1       A        100 0.0200
2       B         60 0.0040
3       C        700 0.0012
4       D       1500 0.0010
5       E        450 0.0300

and I'd like to plot a heatmap whose market cap is proportional to the
size of the cell, similar to http://finviz.com/map.ashx. Could
somebody please give me a pointer? Thanks.

-k