SAS宏在临床试验中应用－记录数据集观测个数

shiyiming

[code:79954]%macro numobs(dsn);
%global num;
data _null_;
if 0 then set &dsn nobs=nobs;
call symput('num',trim(left(put(nobs,8.))));
stop;
run;
%mend;

%numobs(sashelp.class)
%put _user_;[/code:79954]

shiyiming

if [color=red:84cb9]0 [/color:84cb9]then set &dsn nobs=nobs;
0是什么意思？
谢谢！

shiyiming

[code:db9ba]%macro numobs(dsn);
%let num=0;
%let dsid=%sysfunc(open(&dsn, i));
%let num=%sysfunc(attrn(&dsid, nlobs));
%let rc=%sysfunc(close(&dsid));
#
%mend numobs;

%let obs=%numobs(sashelp.class);
%put obs: &obs;[/code:db9ba]

shiyiming

都是怎么想出来的啊，我差的太多了，只有继续努力 <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt=":(" title="Sad" /><!-- s:( -->

shiyiming

我也要学习！

shiyiming

%macro numobs(data);
        %global num;
        proc sql noprint;
                select count(*) into :num
                from &amp;data;
        quit;
%mend numobs;