Rosling.bubbles {animation} R Documentation

## The bubbles animation in Hans Rosling's Talk

### Description

In Hans Rosling's attractive talk “Debunking third-world myths with the best stats you've ever seen”, he used a lot of bubble plots to illustrate trends behind the data over time. This function gives an imitation of those moving bubbles, besides, as this function is based on `symbols`, we can also make use of other symbols such as squares, rectangles, thermometers, etc.

### Usage

```Rosling.bubbles(x, y, data, type = c("circles", "squares", "rectangles", "stars",
"thermometers", "boxplots"), bg, xlim = range(x), ylim = range(y), main = NULL,
xlab = "x", ylab = "y", ..., grid = TRUE, text = 1:ani.options("nmax"),
text.col = rgb(0, 0, 0, 0.5), text.cex = 5)
```

### Arguments

 `x, y` the x and y co-ordinates for the centres of the bubbles (symbols). Default to be 10 uniform random numbers in [0, 1] for each single image frame (so the length should be 10 * `ani.options('nmax')`) `type, data` the type and data for symbols; see `symbols`. The default type is `circles`. `bg, main, xlim, ylim, xlab, ylab, ...` see `symbols`. Note that `bg` has default values taking semi-transparent colors. `grid` logical; add a grid to the plot? `text` a character vector to be added to the plot one by one (e.g. the year in Rosling's talk) `text.col, text.cex` color and magnification of the background text

### Details

Suppose we have observations of n individuals over `ani.options('nmax')` years. In this animation, the data of each year will be shown in the bubbles (symbols) plot; as time goes on, certain trends will be revealed (like those in Rosling's talk). Please note that the arrangement of the data for bubbles (symbols) should be a matrix like A_{ijk} in which i is the individual id (from 1 to n), j denotes the j-th variable (from 1 to p) and k indicates the time from 1 to `ani.options('nmax')`.

And the length of `x` and `y` should be equal to the number of rows of this matrix.

`NULL`.

Yihui Xie

### References

`symbols`