In R, I could do:
> a <- c(1,2,3,4)
> smalla <- a<3
> smalla
[1] TRUE TRUE FALSE FALSE
But how do I create such a variable 'smalla' in python via RPy?
Here is what I tried, none works:
>>> from rpy import *
>>> a = (1,2,3,4)
>>> smalla = r(a<3)
>>> smalla
False
>>> smalla = r("a<3")
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
File "C:\Python25\Lib\site-packages\rpy.py", line 322, in __call__
return self.eval(self.parse(text=s))
RPy_RException: Error in eval(expr, envir, enclos) : object "a" not
found
>>> smalla = r("x<3", r.data_frame(x=a))
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
TypeError: __call__() takes exactly 2 arguments (3 given)
>>>
Many thanks,
Minhua
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