[R] mtext / expression and font type of bold

[Uwe Ligges]

Al Piszcz wrote:

> mtext does not appear to be rendering a 'bold' expression.
> Is there another parameter to set? Thx.
> 
> example (does not create bold (font=2) on plot)
>   mtext( font=2, expression(paste(y, " = ",  x + z), side=3 )

Mathematical expressions are handled differently from normal text.

You might want to use
   mtext(expression(bold(y == x + z)), side = 3)

See ?plotmath for details.

Uwe Ligges