topic Re: Invoking two different macros in a macro separately by passing different value to the parameter in SAS Programming

Invoking two different macros in a macro separately by passing different value to the parameter

SAS_USER10 — Sun, 12 May 2019 04:53:48 GMT

I am trying to create a macro within i am calling two other macros separately when passing different values to the parameter.

something like that-

1) %macro A;

code

%mend A;

2) %macro B;

code;

%mend B;

3) %macro AB (var=);

code;

%mend AB;

how do i write the code in macro AB that if i try to call it by passing (var=A) it will call macro A and if its (var=B) it will call macro B.

how can i do - %macro AB (var=);

%&var;

%mend;

%AB(var=A);

Thanks.

Re: Invoking two different macros in a macro separately by passing different value to the parameter

Tom — Sun, 12 May 2019 05:07:33 GMT

Did you try the code you posted? It should work.

Re: Invoking two different macros in a macro separately by passing different value to the parameter

Shmuel — Sun, 12 May 2019 05:15:44 GMT

I suppose what you want is:

%macro A(var=);
      code
%mend A;

%macro B(var=);
       code;
%mend B;

%macro AB;
    %A(var=A);
    %B(var=B);      
%mend AB;

Re: Invoking two different macros in a macro separately by passing different value to the parameter

SAS_USER10 — Sun, 12 May 2019 05:43:02 GMT

Thanks Sir, it worked.

But i have a question, it may sound silly but what if we have 30-50 or more macros to call inside a macro.

can we do it without typing all the macros like %A(var=A), %B(var=B).........

I mean how can we make code more generic in nature? or even is it possible to write a generic code for it?

Re: Invoking two different macros in a macro separately by passing different value to the parameter

Tom — Sun, 12 May 2019 15:36:15 GMT

@SAS_USER10 wrote:

Thanks Sir, it worked.

But i have a question, it may sound silly but what if we have 30-50 or more macros to call inside a macro.

can we do it without typing all the macros like %A(var=A), %B(var=B).........

I mean how can we make code more generic in nature? or even is it possible to write a generic code for it?

Hypothetical questions are hard to answer.

In general if you have a complex code generation problem then you will probably find it to be much easier to use metadata (data about data) to drive the process. Then you can use a DATA step to generate the code from the metadata. You can reduce the complexity of the code generation step by creating macros encapsulate some steps.

Say you had a list of "runs" you wanted to make. And each run had one or more macro calls it wanted to generate. Then you might use a step like this to generate code from that dataset with that information.

filename code temp;
data _null_;
  set metadata ;
  by run_id;
  file code ;
  if first.run_id then put '%init_session(' run_id= ')';
  put '%' macro_name '(' parameter_values ')';
  if last.run_id then put '%term_session(' run_id= ')';
run;
%include code / source2;

Now you can debug the code generation step by examining the program that is being generated.

Re: Invoking two different macros in a macro separately by passing different value to the parameter

SAS_USER10 — Sun, 12 May 2019 20:07:05 GMT

Thanks Tom for the nice explanation.

Down here is what i actually need to do.....

%macro dm_attrib;
attrib usubjid length = $20 label = "Unique subject identifier"....
%mend;

%macro vs_attrib;
%mend;

%macro attrib(domain=);
%&domain._attrib;
%mend;

%attrib(domain=dm);

create macros dm_attrib and vs_attrib, now create a new macro attrib in a way that when i pass the value dm to parameter domain

it will invoke macro dm_attrib and when i pass vs it will call vs_attrib.

Re: Invoking two different macros in a macro separately by passing different value to the parameter

ScottBass — Mon, 13 May 2019 01:58:31 GMT

%macro foo;
   %put &sysmacroname;
%mend;
%macro bar;
   %put &sysmacroname;
%mend;
%macro blah;
   %put &sysmacroname;
%mend;
%macro baz;
   %put &sysmacroname;
%mend;
%macro code;
   %&word
%mend;
%loop(foo bar blah baz)

See https://github.com/scottbass/SAS/tree/master/Macro for the %loop macro.

Re: Invoking two different macros in a macro separately by passing different value to the parameter

SAS_USER10 — Thu, 16 May 2019 18:29:35 GMT

Sure, Thanks! I appreciate