Text wrap

Hi everyone.

I have a long label that I would like to split. I found that I could  
use
"strwrap" for simple text. However, this is not working with this  
label:

plot(...., ylab = strwrap(str,20),...)

I suspect this is because I'm using "expression" for form my label.

I also tried with \n but this is not working either.

And the plotmath page warns you that it won't work

Have you looked at 'atop'?
Perhaps something like this ... after making an effort to interpret  
your incompletely describe goals:

plot(1,1, sub= expression(atop("< 20 ?m phytoplankton  
","(cells?mL"^-1*")")))

You had two commas in that origial express and it wasn't at all clear  
why.

David Winsemius, MD
West Hartford, CT

Hi everyone.

I have a long label that I would like to split. I found that I could use
"strwrap" for simple text. However, this is not working with this label:

str = expression(paste("< 20 ?m phytoplankton ","(cells ? ",mL^-1,")"))

plot(...., ylab = strwrap(str,20),...)

I suspect this is because I'm using "expression" for form my label.

I also tried with \n but this is not working either.

Regards,
Phil

plotmath expressions do not support new lines within the expression. From ?plotmath:

 "Control characters (e.g. \n) are not interpreted in character strings in plotmath, unlike normal plotting."

You would need to create each line as a separate expression and use ?mtext, if you wish, to place each line along the axis, using the 'line' argument for placement/spacing.

HTH,

Marc Schwartz

Thank you Mark for your help. It worked perfectly with 2 expression and
mtext.

Regards,
Phil

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