On 10.10.2013 21:40, Sheri wrote:
Hi everyone,
I am hoping someone can help with my attempted use of the expression
function. I have a long series of text and variable to paste together
including a degree symbol. The text is to be placed on my scatter plot
using the mtext function.
Using expression like this:
changetext = expression(paste("Change from ",mini," to ", maxi, ":",
diff ,degree,"C",collapse=""))
does not evaluate my user defined variables - mini,maxi, and diff -
just printing them out as words
Using expression like this:
changetext = paste("Change from ",mini," to ", maxi, ":", diff
,expression(degree,"C"),collapse="")
prints the text twice and does not evaluate the degree symbol.
I have tried to place the expression alone in a variable and then run the paste:
degsym = expression(degree,"C")
changetext = paste("Change from ",mini," to ", maxi, ":", diff
,degsym,collapse="")
giving me the same result as the second option
Is there any way I can use the expression function as in the first
example but still have R evaluate my user defined variables?
Thanks!
Sheri
I'd rather use substitute for substitution of the symbols and get:
plot(1, main = substitute("Change from " * mini * " to " * maxi * ": " *
diff * degree * "C", list(mini=mini, maxi=maxi,diff=diff)))
Best,
Uwe Ligges
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