DATA uspresidents;
    Infile 'F:\SAS\testbook1\Presidents.dat';
;
RUN;

PROC print data=uspresidents;
RUN
;

为什么我把Presidents.dat中的数据改动以后，打印出来的数据却是没改之前的？

数据为：
Adams   F 2
Lincoln R 16
Grant   R 18
Kennedy D 35

运行一次以后，我把最后一个的35改为36：
Adams   F 2
Lincoln R 16
Grant   R 18
Kennedy D 36

但是打印出来的结果却还是显示35，为什么？

LOG中显示：
ERROR: Physical file does not exist, F:\SAS\testbook1\Presidents.dat.

NOTE: The SAS System stopped processing this step because of errors.
WARNING: The data set WORK.USPRESIDENTS may be incomplete.  When this step was stopped there were 0 observations and 3 variables.
WARNING: Data set WORK.USPRESIDENTS was not replaced because this step was stopped.

可是路径明明就是对的呀。。。



补充1：数据肯定没有被重新读入，我将uspresidents改为uspresidents1，运行后打开work中新生成的uspresidents1，显示只有0个数据