[R] plotmath and logical operators?
MacQueen, Don
m@cqueen1 @ending from llnl@gov
Mon Aug 20 22:53:39 CEST 2018
I would like to use plotmath to annotate a plot with an expression that includes a logical operator.
## works well
tmp <- expression(x >= 3)
plot(1)
mtext(tmp)
## not so well
tmp <- expression(x >= 3 & y <= 3)
plot(1)
mtext(tmp)
Although the text that's displayed makes sense, it won't be obvious to my non-mathematical audience.
I'd appreciate suggestions.
I've found a work-around that gets the annotation to look right
tmpw <- expression(paste( x >= 3, " & ", y <= 3) )
plot(1)
mtext(tmpw)
But it breaks my original purpose, illustrated by this example:
df <- data.frame(x=1:5, y=1:5)
tmp <- expression(x >= 3 & y <= 3)
tmpw <- expression(paste( x >= 3, " & ", y <= 3) )
with(df, eval(tmp))
[1] FALSE FALSE TRUE FALSE FALSE
with(df, eval(tmpw))
[1] "FALSE & TRUE" "FALSE & TRUE" "TRUE & TRUE" "TRUE & FALSE" "TRUE & FALSE"
Thanks
-Don
--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
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