| expression {base} | R Documentation |
Creates or tests for objects of mode "expression".
expression(...) is.expression(x) as.expression(x, ...)
... |
valid R expressions. |
x |
an arbitrary R object. |
expression returns a vector of mode "expression"
containing its arguments as unevaluated “calls”.
is.expression returns TRUE if expr is an
expression object and FALSE otherwise.
as.expression attempts to coerce its argument into an
expression object.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
call,
eval,
function.
Further,
text and
legend
for plotting math expressions.
length(ex1 <- expression(1+ 0:9))# 1 ex1 eval(ex1)# 1:10 length(ex3 <- expression(u,v, 1+ 0:9))# 3 mode(ex3 [3]) # expression mode(ex3[[3]])# call rm(ex3)