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
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