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About function define

bobbygang

Hi, I wrote function define code like this :

procedure(MMM(A B C D E)
                   setplist(A '(B D C E))
                   F=getqq(A B)
                   F
)

I want to achieve that when I input :    MMM(bobby xx (1 2 ) yy (3 4))

it will give me the result :        (1 2)

But it always tell me          *Error* eval : unbound variable  -bobby

Does it mean that when I use the function MMM I should define symbol "bobby" "xx" "yy" first?

I think it's too cumbersome. How to solve this problem ?

Parents

  • nprocedures are not the right way to do this really because usually they rely on runtime evaluation - in this case they don't, but nprocedures don't generally work properly in SKILL++ code (in this case it does work, but you still get a warning). BTW, there's a typo in Lawrence's code anyway - the getqq should be a get (no "q" at all) otherwise it doesn't work.

    Assuming you didn't really want a global variable F in the code, I  would do this as a macro (which is the right way to do this):

     defmacro(MMM (A B C D E)
      `{
        setplist(',A '(,B ,C ,D ,E))
        getqq(,A ,B)
        }
    )

    (be careful about the quotes here - the one  before the open curly bracket is a backquote; this allows selective evaluation within the macro). Macros are evaluated at "compile" time - so they will be expanded in place.

    If you really want the variable F to be assigned, just put F= before the getqq in the macro.

    Regards,

    Andrew.

Reply

  • nprocedures are not the right way to do this really because usually they rely on runtime evaluation - in this case they don't, but nprocedures don't generally work properly in SKILL++ code (in this case it does work, but you still get a warning). BTW, there's a typo in Lawrence's code anyway - the getqq should be a get (no "q" at all) otherwise it doesn't work.

    Assuming you didn't really want a global variable F in the code, I  would do this as a macro (which is the right way to do this):

     defmacro(MMM (A B C D E)
      `{
        setplist(',A '(,B ,C ,D ,E))
        getqq(,A ,B)
        }
    )

    (be careful about the quotes here - the one  before the open curly bracket is a backquote; this allows selective evaluation within the macro). Macros are evaluated at "compile" time - so they will be expanded in place.

    If you really want the variable F to be assigned, just put F= before the getqq in the macro.

    Regards,

    Andrew.

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