Well, I don't get it very clearly. I learnt that 'esc' changes variable names of a local variable in the macro. But I want to reference the global variable out of the macro. I have little idea of Lisp macros, so I think I still cannot handle this. Would you please add more details?
Yi On Wed, Jan 14, 2015 at 11:37 PM, Isaiah Norton <isaiah.nor...@gmail.com> wrote: > You need to use 'esc' -- see the hygiene part of the metaprog section in > the manual. > On Jan 14, 2015 8:56 AM, "yi lu" <zhiwudazhanjiang...@gmail.com> wrote: > >> Hi, >> >> I am able to write a simple macro to drop brackets. >> https://gist.github.com/eccstartup/36637d96355bd5ca8188 >> >> But there is some problem with this. >> >> You can see the @nobrace macro that drop brackets of functions. >> For example: >> ``` >> @nobrace map (x->x^2-1) 1:0.01:2 >> ``` >> get a list of Float numbers. This is fine. >> >> However, in the macro, we cannot see global variables. >> For example: >> ``` >> arr = @nobrace map (x->x^2-1) 1:0.01:2 >> print(arr) >> ``` >> will print the "arr" list, but >> ``` >> arr = @nobrace map (x->x^2-1) 1:0.01:2 >> @nobrace print arr >> ``` >> will report "arr not found". >> >> Is there a remedy? >> >> >> Yours, >> Yi >> >
