Here you are:
>>> from rpy import *
>>> a=[1,2,3,4]
>>> b=r['<'](a,3)
>>> b
[True, True, False, False]
>>>
2008/7/25 Zhang, Minhua <[EMAIL PROTECTED]>:
> 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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