Combining math and variables in expression
Dear socrates; It did not take me 2.5 hours but it did take longer than I thought it would. I worked off the example given by Henrique Dallazuanna seen at: http://finzi.psych.upenn.edu/R/Rhelp08/archive/120065.html This seems "to work": mtext(bquote(100~"%" ~ Area == ~ .(text.val)~ Km^2), side=3) I cannot say the the syntactic rules are entirely clear. The proper placement of the tildes is a bit mysterious to me. I am wondering if a solution using substitute(expression(.)) might be more clear but my efforts in that direction were not successful. -- David
On Mar 11, 2009, at 10:08 AM, socrates wrote:
I am trying to get the following line in a plot margin using mtext: 100% Area = 120.000 km^2 Where I intend that "100% Area =" is text, 120.000 is a number that varies according to different data, and km^2 should be a neat km-with-superscript-2. The expression function fails me, since it apparently cannot coerce an expression when a variable is involved. In the R help file there is an example using either bquote or substitute to accomplish like things, but these are sufficiently different from my objective and I am becoming more and more confused by every further example I stumble on. This should be easy. Can anyone help me prevent spending anoter 2.5 hours on the matter? Thanks. -- View this message in context: http://www.nabble.com/Combining-math-and-variables-in-expression-tp22455877p22455877.html Sent from the R help mailing list archive at Nabble.com.
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