On 19/08/2009, Gavin Simpson <gavin.simp...@ucl.ac.uk> wrote: > On Wed, 2009-08-19 at 14:20 +0100, e-letter wrote: >> On 18/08/2009, Gavin Simpson <gavin.simp...@ucl.ac.uk> wrote: >> > On Tue, 2009-08-18 at 13:06 +0100, e-letter wrote: >> >> On 17/08/2009, Michael Knudsen <micknud...@gmail.com> wrote: >> >> > On Mon, Aug 17, 2009 at 12:51 PM, e-letter <inp...@gmail.com> wrote: >> >> > >> >> >> I have tried to add the delta (δ) symbol to the y axis label and the >> >> >> result is &D, using the command: >> >> >> >> >> >> ...ylab="δt"... >> >> > >> >> > Try ylab = expression(delta*t) instead. >> >> > >> >> This does not work, the result is >> >> expression(delta*t) >> > >> > It works for the rest of us who suggested this. >> > >> > plot(1:10, ylab = expression(delta*t)) >> > >> True, but the following commands fails: >> plot(1:10,ylab="temperature expression(delta*t)") >> plot(1:10,ylab="temperature" expression(delta*t)) >> Error: syntax error, unexpected SYMBOL, expecting ',' in >> "plot(1:10,ylab="temperature" expression" >> >> So I want to be able to have 'δt' and 'temperature δt' as a y-axis label. > > Ah, but you never said that. We aren't mind readers you know ;-) > > What you need is an expression that will, when used, give you a text > label containing "Temperature δt". What you have done is create a > character string of the literal "...expression(delta*t)" which is of > course why it is printed as the label - after all , you asked R to do > this. > > I suggest you read the plotmath help page, accessed via: > > ?plotmath > > executed at the prompt. > > I found this expression stuff complicated when I first started out, > until I realised that whatever gets passed to expression(....) has to be > a syntactically valid R command. So for your particular example we need: > > plot(1:10, ylab = expression(Temperature ~ delta*t)) > > Temperature is treated as the character string "Temperature"; the "~" > means leave some space between the bits either side of "~"; delta is a > special name that will get replaced by the relevant glyph; the "*" > juxtaposes delta and "t", ie places them next to one another without any > space in between. > Being familiar with latex, I interpret your description of the tilde (~) as non-breaking space, therefore I used the command: plot(1:10,ylab=expression(temperature~delta*t)) to give me the result I wanted; in other words the space characters are not needed between temperature,~ and delta in your suggestion.
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