hash - Hash Merge Macro - 使用文件记录指示器“HASH + point = Key”
问题描述
希望将此宏更新为 HASH + point = key。对于我们的一次数据运行,我们已经开始使用当前版本的此宏超出内存限制。我寻求帮助的原因是因为我没有太多时间,也从未真正分析过这段代码,因为直到最近它才成为我流程的一部分。
我不太了解https://www.lexjansen.com/nesug/nesug11/ld/ld01.pdf是如何设置 RID 以及如何将其合并到我们的宏中。实际上,我什至不知道是否可以使用我们当前的宏来做到这一点。
任何帮助将不胜感激。
%macro hashmerge2(varnm,onto,from,byvars,obsqty);
%let data_vars = %trim (&varnm);
%let data_vars_a = %sysfunc(tranwrd(&data_vars.,%str( ),%str(" , ")));
%let data_vars_b = %sysfunc(tranwrd(&data_vars.,%str( ), %str(,)));
%let data_key = %trim (&byvars);
%let data_key = %sysfunc(tranwrd(&data_key.,%str( ), %str(" , ")));
%if %index(&varnm,' ') > 0 %then %let varnm3=%substr(%substr(&varnm,1,%index(&varnm,' ')),1,4);
%else %let varnm3=%substr(&varnm,1,4);
data &onto(drop=rc) miss&varnm3(drop=rc);
if 0 then set &onto &from(keep=&varnm. &byvars.);
declare hash h_merge (dataset: "&from.");
rc = h_merge.DefineKey ("&data_key.");
rc = h_merge.DefineData ("&data_vars_a.");
rc = h_merge.DefineDone ();
do until (eof);
set &onto end = eof;
call missing(&data_vars_b.);
rc = h_merge.find ();
if rc = 0 then do;
output &onto;
from = "&from.";
end;
else do;
output miss&varnm3 &onto;
from = "&onto.";
end;
end;
stop;
run;
%mend;
解决方案
所以我认为这就是你要找的,但它仍然需要将“查找”表中的所有键值加载到哈希对象中。但它可以节省空间,而不是加载非关键变量,它只需要加载与关键变量匹配的观察数。
%macro hash_merge_point
/*-----------------------------------------------------------------------------
Merge variables ONTO large table FROM small table using POINT= dataset option.
-----------------------------------------------------------------------------*/
(varnm /* Space delimited list of variable to retrieve */
,onto /* Dataset to update */
,from /* Dataset to get values from */
,byvars /* Space delimited list of key variables to match on */
);
%local missds key_vars;
%let missds=%scan(&varnm,1,%str( ));
%let missds=miss%substr(&missds,1,%sysfunc(min(28,%length(&missds))));
%let key_vars="%sysfunc(tranwrd(%sysfunc(compbl(&byvars)),%str( )," "))";
data &onto(drop=rc) &missds(drop=rc);
if 0 then set &onto &from(keep=&varnm. &byvars.);
declare hash h_merge ();
rc = h_merge.DefineKey (&key_vars);
rc = h_merge.DefineData ('_point');
rc = h_merge.DefineDone ();
do _point=1 to _nobs;
set &from(keep=&byvars) point=_point nobs=_nobs;
rc = h_merge.add();
end;
do until (eof);
set &onto end = eof;
rc = h_merge.find ();
if rc = 0 then do;
set &from (keep=&varnm) point=_point;
from = "&from.";
output &onto;
end;
else do;
call missing(of &varnm);
from = "&onto.";
output ;
end;
end;
stop;
run;
%mend hash_merge_point;
所以这是一个简单的例子:
data lookup;
input id age sex $1.;
cards;
1 10 F
2 20 .
4 30 M
;
data master ;
input id wt ;
cards;
1 100
2 150
3 180
4 200
;
%hash_merge_point
/*-----------------------------------------------------------------------------
Merge variables ONTO large table FROM small table using POINT= dataset option.
-----------------------------------------------------------------------------*/
(varnm=age sex /* Space delimited list of variable to retrieve */
,onto=master /* Dataset to update */
,from=lookup /* Dataset to get values from */
,byvars=id /* Space delimited list of key variables to match on */
);
如果目标表已经包含由合并创建的变量(因此您只想覆盖当前值),那么您可以使用 MODIFY 语句而不是 SET 语句来修改数据集。但您可能希望在尝试此操作之前确保您有表的备份。另请注意,如果您想要源变量的标志from
,那么该变量也需要存在。
所以有了这个更新的主表:
data master ;
input id wt ;
length age 8 sex $1 from $50;
cards;
1 100
2 150
3 180
4 200
;
而这个版本的宏:
%macro hash_merge_point
/*-----------------------------------------------------------------------------
Merge variables ONTO large table FROM small table using POINT= dataset option.
-----------------------------------------------------------------------------*/
(varnm /* Space delimited list of variable to retrieve */
,onto /* Dataset to update */
,from /* Dataset to get values from */
,byvars /* Space delimited list of key variables to match on */
);
%local key_vars;
%let key_vars="%sysfunc(tranwrd(%sysfunc(compbl(&byvars)),%str( )," "))";
data &onto;
if 0 then set &onto (keep=&byvars.);
declare hash h_merge ();
rc = h_merge.DefineKey (&key_vars);
rc = h_merge.DefineData ('_point');
rc = h_merge.DefineDone ();
do _point=1 to _nobs;
set &from(keep=&byvars) point=_point nobs=_nobs;
rc = h_merge.add();
end;
do until (eof);
modify &onto end = eof;
rc = h_merge.find ();
if rc = 0 then do;
set &from (keep=&varnm) point=_point;
from = "&from.";
end;
else from = "&onto.";
replace;
end;
stop;
run;
%mend hash_merge_point;
如果您运行此代码:
proc print data=master;
title 'BEFORE';
run;
%hash_merge_point
/*-----------------------------------------------------------------------------
Merge variables ONTO large table FROM small table using POINT= dataset option.
-----------------------------------------------------------------------------*/
(varnm=age sex /* Space delimited list of variable to retrieve */
,onto=master /* Dataset to update */
,from=lookup /* Dataset to get values from */
,byvars=id /* Space delimited list of key variables to match on */
);
proc print data=master;
title 'AFTER';
run;
你得到这个结果:
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