prettye: Convert scientific notation to pretty expressions
In tobyjohnson/gtx: Genetics ToolboX

Description Usage Arguments Details Value Author(s) Examples

Converts scientific notation numbers to expressions suitable for pretty printing, by converting an e character to an expression for times-ten-to-the-power-of.

1	prettye(x)

`x`	a character vector

The argument should be a character vector (and is immediately coerced using as.character). The return value is constructed using characters before the ‘e’ as the mantissa and characters after the ‘e’ as the exponent. Therefore, any control of the number of digits to be displayed should be performed using e.g. format before calling prettye.

An expression vector. (Generated using sapply with individual expression return values seems to be converted into an expression with multiple elements.)

Toby Johnson Toby.x.Johnson@gsk.com

p <- 1/(1:10)*10^-(1:10)
plot(1:length(p), -log10(p),
     type = "p", pch = 19, 
     ylim = c(0, max(-log10(p))), las = 1, 
     xlab = "index", ylab = expression(-log[10](P)))
text(1:length(p), -log10(p), prettye(format(p, digits = 3)), pos = 1)