[R] computing on expressions

Henrique Dallazuanna wwwhsd at gmail.com
Fri Oct 3 18:08:47 CEST 2008

Try this:

parse(text = paste(capture.output(expr[[1]]), " & b > 0"))

On Fri, Oct 3, 2008 at 12:48 PM, Vadim Organovich
<vogranovich at jumptrading.com> wrote:
> Dear R-users,
> Suppose I have an expression:
> expr = expression(a>0)
> and now I want to modify it to expression(a>0 & b>0). The following doesn't work:
> expr = expression(expr & b>0)
> What would be a good way of doing this?
> Thanks,
> Vadim
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Henrique Dallazuanna
25° 25' 40" S 49° 16' 22" O

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