宏正在将数字输入转换为字符。如何将其改回数字?

does not make a distinction between character and numeric values as the rest of SAS does (链接到SAS文档)。我使用如下所示的%eval函数对此进行了确认:

%else %if %eval(&split) <= 0 or %eval(&split) >= 1 %then %do;
    %put ERROR: The specified split of the data must be within the following range of real numbers (0,1].;
%end;

我如何解决这个问题,使它能够正确读取我输入的宏变量“split”的小数?

可以使用以下示例代码:

data test (drop=i);
do i=1 to 1000;
a=round(uniform(1)*4,.01);
b=round(uniform(1)*10,.01);
c=round(uniform(1)*7.5,.01);
if b<2 then d=1;
else d=0;
if i<500 then y=1;
else y=0;
output;
end;
stop;
run;

%macro train_valid(split=);
    %if &split =  %then %put ERROR: Missing an input. Check to make sure the macro variable has an input.;
    %else %if &split <= 0 or &split >= 1 %then %do;
        %put ERROR: The specified split of the data must be within the following range of real numbers (0,1].;
    %end;
    %else %do;
        proc surveyselect data=test samprate=&split seed=1000 out=Sample outall 
            method=srs noprint;
         run;
        data test_train; 
            set Sample; 
                where selected = 1;
        run; 
        data test_valid;
            set Sample; 
                where selected = 0;
        run;
    %end; 
%mend;
%train_valid(split=.75);