Re: [Rd] WISH: eval() to preserve the visibility (now value is always visible)

On Sun, Feb 8, 2015 at 8:44 PM, Suharto Anggono Suharto Anggono via R-devel r-devel@r-project.org wrote: Sorry to intervene. No, I'm very happy you intervened. You're comment is 100% valid/correct making my wish moot. Your explanation is very clear and nails it; one should use

Re: [Rd] WISH: eval() to preserve the visibility (now value is always visible)

Sorry to intervene. Argument passed to 'eval' is evaluated first. So, eval(x - 2) is effectively like { x - 2; eval(2) } , which is effectively { x - 2; 2 } . The result is visible. eval(expression(x - 2)) or eval(quote(x - 2)) or evalq(x - 2) gives the same effect as x - 2 . The result is

Re: [Rd] WISH: eval() to preserve the visibility (now value is always visible)

On 07/02/2015 12:40 PM, Henrik Bengtsson wrote: Would it be possible to have the value of eval() preserve the visibility of the value of the expression? PROBLEM: # Invisible x - 1 # Visible eval(x - 2) [1] 2 TROUBLESHOOTING: withVisible(x - 1) $value [1] 1 $visible [1]

[Rd] WISH: eval() to preserve the visibility (now value is always visible)

Would it be possible to have the value of eval() preserve the visibility of the value of the expression? PROBLEM: # Invisible x - 1 # Visible eval(x - 2) [1] 2 TROUBLESHOOTING: withVisible(x - 1) $value [1] 1 $visible [1] FALSE withVisible(eval(x - 2)) $value [1] 2 $visible [1] TRUE